AU702438B2 - DNA encoding a human neuropeptide Y/peptide YY/pancreatic polypeptide receptor (Y4) and uses thereof - Google Patents

Abstract

This invention provides an isolated nucleic acid molecule encoding a human Y4 receptor, an isolated protein which is a human Y4 receptor, vectors comprising an isolated nucleic acid molecule encoding a human Y4 receptor, mammalian cells comprising such vectors, antibodies directed to the human Y4 receptor, nucleic acid probes useful for detecting nucleic acid encoding human Y4 receptor, antisense oligonucleotides complementary to any sequences of a nucleic acid molecule which encodes a human Y4 receptor, pharmaceutical compounds related to human Y4 receptors, and nonhuman transgenic animals which express DNA encoding a normal or a mutant human Y4 receptor. This invention further provides methods for determining ligand binding, detecting expression, drug screening, and treatment involving the human Y4 receptor.

Description

II LglBSC- WO 95/17906 PCTIUS94/14436 -1- DNA ENCODING A HUMI-I! NEUROPEPTIDE Y/PEPTIDE YY/PANCREATIC POLYPEPTIDE RECEPTOR (Y4) AND USES THEREOF Background of the Invention Throughout this application, various publications are referenced in parenthesis by Author and year. Full citations for these references may be found at the end of the specification immediately preceding the claims. The disclosure of these publications is hereby incorporated by reference into this application to describe more fully the art to which this invention pertains.

Neuropeptides are small peptides originating from large precursor proteins synthesized by peptidergic neurons and endocrine/paracrine cells. They hold promise for treatment of neurological, psychiatric, and endocrine disorders (De Wied, 1990). Often the precursors contain multiple biologically active peptides. There is great diversity of neuropeptides in the brain caused by alternative splicing of primary gene transcripts and differential precursor processing. The neuropeptide receptors serve to discriminate between ligands and to activate the appropriate signals. Thus, it is expected that the receptors for neuropeptides consist of a large number of members.

Neuropeptide Y (NPY), a 36-amino acid peptide, is the most abundant neuropeptide to be identified in mammalian brain. NPY is an important regulator in both the central and peripheral nervous systems (Heilig et al., 1990) and j influences a diverse range of physiological parameters, I 35 including effects on psychomotor activity, food intake, central endocrine secretion, and vasoactivity in the cardiovascular system. High concentrations of NPY are found in the sympathetic nerves supplying the coronary, cerebral, and renal vasculature and has contributed to Awl. -r eM SWO 95/17906 PCT/US94/14436 S-2vasoconstriction. NPY binding sites have been identified in a variety of tissues, including spleen (Lundberg et al., 1988), intestinal membranes, brain (Hinson et al., 1988), aortic smooth muscle (Mihara et al., 1989), kidney, testis, and placenta (Dumont et al., 1992). In Saddition, binding sites have been reported in a number of rat and human cell lines (eg. Y1 in SK-N-MC, MC-IXC, CHP- 212, and PC12 cells; Y2 in SK-N-Be(2), CHP-234, and SMS- MSN)(Aakerlund et al., 1990; Grundemar et al., 1993).

NPY forms a family (called the pancreatic polypeptide family) together with pancreatic polypeptide (PP) and peptide YY (PYY) which all consist of 36 amino acids and have a common tertiary structure, the so-called PP-fold (Glover et al., 1985). Specific features of this family include a polyproline helix in residues 1 through 8, a- turn in residues 9 through 14, an a-helix in residues through 30, an outward-projecting C-terminus in residues through 36, and a carboxy terminal amide which appears to be critical for biological activity (Schwartz et al., 1990). The C-terminal amidated residue of these peptides is essential for biological activity (Wahlestedt et al., 1986). Studies with peptide fragments of NPY have indicated that multiple NPY receptor subtypes exist (Wahlestedt et al., 1986). Three major NPY receptor subtypes (Y1, Y2 and Y3) have been defined by pharmacological criteria, with a fourth "atypical" Y1 receptor that has been proposed to regulate feeding behavior. The only NPY receptor which has been cloned to date is the Y1 receptor gene, from mouse (Eva et al., 1992), rat (Eva et al., 1990), and human (Larhammar et al., 1992). One of the key pharmacological features which distinguish Y1 and Y2 is the fact that the Y1 receptor (and not the Y2 receptor) responds to an analog I, 35 of NPY modified at residues 31 and 34 ([Leu31,Pro34]NPY), whereas the Y2 receptor (and not the Y1 receptor) has Shigh 'affinity for the NPY peptide carboxyl-terminal r WO 95/17906 PCT/US94/14436 -3fragment NPY-(13-36)(Wahlstedt et al., 198C; Fuhlendorff et al., 1990).

Receptor genes for the other two structurally related peptides, peptide YY (PYY) and pancreatic polypeptide also have not been cloned. Peptide YY occurs mainly in endocrine cells in the lower gastrointestinal tract (Bottcher et al., 1984). Receptors for PYY were K first described in the rat small intestine (Laburthe et al., 1986). This receptor has been defined as PYYpreferring because it displays a 5-10 fold higher affinity for PYY than for NPY (Laburthe et al., 1986; Laburthe, 1990). Recently, a cell line, PKSV-PCT, derived from the proximal tubules of kidneys, has been described to express receptors for PYY (Voisin et al., 1993). Pancreatic polypeptide is predominantly located in endocrine cells of the pancreatic islets (Alumets et al., 1978). PP inhibits pancreatic exocrine secretion and gall bladder contraction (Schwartz, 1983).

Interestingly, PP does not appear to be synthesized in or localized to the central nervous system (Di Maggio et al., 1985), but selective PP binding sites have been found in various brain areas, such as the area postrema and adjacent nuclei, regions permeable at the blood-brain barrier (Whitcomb et al., 1990). PP receptors have a much higher affinity for PP than for NPY or PYY (Inui et al., 1990). PP has been shown to bind with high affinity to binding sites on a pheochromocytoma cell line, PC12 (Schwartz et al., 1987). The rank order of affinity for J 30 the pharmacologically defined receptors of NPY and related peptides are listed in Table 1.

Using an homology screening approach to clone novel NPY receptor genes, we describe here the isolation and characterization of a novel NPY/PYY/PP receptor clone which we have designated Y4. The Y4 receptor appears to have a unique pharmacological profile, relative to other d I _c~ WO 95/17906 PCT/US94/14436 -4- NPY-related receptors, exhibiting highest affiiity for pancreatic polypeptide itself. This receptor clone will enable us to further examine the possibility of receptor diversity and the existence of multiple subtypes within this family of receptors. These could then serve as invaluable tools for drug design for several pathophysiological conditions such as memory loss, depression, anxiety, epilepsy, pain, hypertension, locomotor problems, circadian rhythm disorders, eating/body weight disorders, sexual/reprductive disorders, nasal congestion, diarrhea, gastrointestinal t and cardiovascular disorders.

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WO 95/17906 PCTIUS94/14436 Summary of the Invention This invention provides an isolated nucleic acid molecule encoding a Y4 receptor.

!k This invention also provides an isolated protein which is a Y4 receptor.

This invention provides a vector comprising an isolated nucleic acid molecule encoding a Y4 receptor. i This invention also provides vectors such as plasmids and baculovirus comprising a nucleic acid molecule encoding i a Y4 receptor, adapted for expression in a bacterial cell, a yeast cell, an insect cell or a mammalian cell which additionally comprise the regulatory elements necessary for expression of the nucleic acid in the i.

bacterial, yeast, insect or mammalian cells operatively linked to the nucleic acid encoding the Y4 receptor as to permit expression thereof.

This invention provides a mammalian cell comprising nucleic acid encoding a Y4 receptor.

This invention provides a method for determining whether a ligand can specifically bind to a Y4 receptor which comprises contacting cell transfected with and expressing nucleic acid encoding a Y4 receptor with the ligand under conditions permitting binding of ligands to such Y4 receptor, and detecting the presence of any of the ligand bound to a Y4 receptor, thereby determining whether the ligand binds specifically to a Y4 receptor.

This invention also provides a method for determining whether a ligand is a Y4 receptor agonist which comprises contacting a cell transfected with and expressing nucleic S acid, encoding a Y4 receptor with the ligand under -II aa~ I 1a ,rwblaslmram~i~ WO 95/17906 PCT/US94/14436 -6conditions permitting the activation of a Y4 receptor functional response from the cell, and detecting by means of a bioassay, such as a second messenger response, an increase in Y4 receptor activity, thereby determining whether the ligand is a Y4 receptor agonist.

This invention further provides a method for determining whether a ligand is a Y4 receptor antagonist which comprises contacting a cell transfected with and expressing nucleic acid encoding a Y4 receptor with the ligand under conditions permitting the activation of a functional Y4 receptor response, and detecting by means of a bioassay, such as a second messenger response, a decrease in Y4 receptor activity, and thereby determining whether the ligand is a Y4 receptor antagonist.

This invention further provides a method of screening drugs to identify drugs which specifically bind to a Y4 receptor which comprises contacting a cell transfected with and expressing nucleic acid encoding a Y4 receptor with a plurality of drugs, and determining those drugs which bind to the cell, thereby identifying drugs which specifically bind to a Y4 receptor.

This invention also provides a method of screening drugs to identify which act as agonists of a Y4 receptor which comprises contacting a cell transfected with and expressing a Y4 receptor with a plurality of drugs under conditions permitting the activation of a functional Y4 receptor response, aad determining those drugs which activate the receptor in the cell using a bioassay such as a second messenger assay, thereby ',dentifying drugs Y4 receptor agonists.

This invention also provides a method of screening drugs to identify drugs which act as antagonists of a Y4 receptor which comprises contacting a cell transfected in n um

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WO 95/17906 PCT/US94/14436 -7with and expressing a Y4 receptor with a plurality of drugs in the presence of a known human Y4 receptor agonist, such as PP, under conditions permitting the.

activation of a functional Y4 receptor response and determining those drugs which inhibit the activation of the receptor in the cell using a bioassay, such as a second messenger assay, thereby identifying drugs which act as antagonists of a Y4 receptor.

a nucleic acid molecule of at least 15 nucleotides capable of specifically hybridizing with a unique sequence included within the sequence of a nucleic acid molecule encoding a Y4 receptor.

This invention also provides a method of detecting expression of the Y4 receptor on the surface of a cell by detecting the presence of mRNA coding for a Y4 receptor which comprises obtaining total mRNA from the cell and contacting the mRNA so obtained with a nucleic acid probe comprising a nucleic acid molecule of at least nucleotides capable of specifically hybridizing with a unique sequence included within the sequence of a nucleic acid molecule encoding a Y4 receptor under hybridizing conditions, detecting the presence of mRNA hybridized to the probe, and thereby detecting the expression of the Y4 receptor by the cell.

This invention provides an antisense oligonucleotide having a sequence capable of hybridizing specifically an mRNA molecule which encodes a Y4 receptor so as to prevent translation of the mRNA molecule.

SThis invention provides an antibody directed to a Y4 receptor.

This invention provides a transgenic nonhuman mammal I WO 95/17906 PCT/US94/14436

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-8j expressing nucleic acid encoding a Y4 receptor. This invention further provides a transgenic nonhuman mammal whose genome comprises antisense DNA complementary to DNA encoding a Y4 receptor so placed as to be transcribed into antisense mRNA which is complementary to mRNA encoding a Y4 receptor and which hybridizes to mRNA encoding a Y4 receptor thereby reducing its translation.

This invention provides a method of determining the physiological effects of expressing varying levels of Y4 receptors which comprises producing a transgenic nonhuman animal whose levels of Y4 receptor expression are varied by use of an inducible promoter which regulates Y4 receptor expression. i This invention also provides a method of determining the physiological effects of expressing varying levels of Y4 receptors which comprises producing a panel of transgenic nonhuman animals each expressing a different amount of Y4 receptor.

This invention provides a method for diagnosing a predisposition to a disorder associated with the activity of a specific human Y4 receptor allele which comprises: a. obtaining nucleic acid of subjects suffering from the disorder; b. performing a restriction digest of the nucleic acid with a panel of restriction enzymes; c.

electrophoretically separating the resulting nucleic acid fragments on a sizing gel; d. contacting the resulting gel with a nucleic acid probe capable of specifically hybridizing to nucleic acid encoding a Y4 receptor and labelled with a detectable marker; e. detecting labelled bands which have hybridized to the nucleic acid encoding j a Y4 receptor labelled with a detectable marker to create a unique band pattern specific to the DNA of subjects suffering from the disorder; f. preparing -i nucleic acid obtained for diagnosis by steps a-e; and g. C rnCCTIClrrP nllLro rrr, Ir rru WO 95/17906 PCT/US94/14436 WO 95/17906 -9comparing the unique band pattern specific to the nucleic acid of subjects suffering from the disorder from step e and the nucleic acid obtained for diagnosis from step f to determine whether the patterns are the same or different and to diagnose thereby predisposition to the disorder if the patterns are the same.

This invention provides a method of preparing the purified, isolated Y4 receptor which comprises a) constructing a vector adapted for expression in a cell which comprises the regulatory elements necessary for the expression of nucleic acid in the cell operativley linked to the nucleic acid encoding a Y4 receptor as to permit expression thereof, wherein the cell is selected from the group consisiting of bacterial cells, yeast cells, insect cells and mammalian cells; b) inserting the vector of stepa in a suitable host cell; c) incubating the cells of step b under conditions allowing the expression of a Y4 receptor; d) recovering the receptor so produced; and e) purifying the receptor so recovered, thereby preparing an isolated, purified Y4 receptor.

This invention also provides a method of preparing the isolated Y4 receptor which comprises inserting nucleic acid encoding Y4 receptor in a suitable vector, inserting the resulting vector in a suitable host cell, recovering the receptor produced by the resulting cell, and purifying the receptor so recovered.

This invention provides an antisense oligonucleotide having a sequence capable of binding specifically with any sequences of an mRNA molecule which encode i the Y4 receptor so as to prevent translation of mRNA molecules which encode the Y4 receptor.

This invention also provides a transgenic nonhuman mammal expressing DNA encoding a human Y4 receptor.

Wiwri-i Mrf ^i *R ri r- c ~L IS LL~ WO 95/17906 PCT/US94/14436 This invention further provides a transgenic nonhuman mammal comprising a homologous recombination knockout of the native Y4 receptor.

This invention also provides a method of determining the Sphysiological effects of expressing varying levels of a receptor which comprises producing a transgenic nonhuman animal whose levels of human Y4 receptor expression are varied by use of an inducible promoter which regulates receptor expression.

This invention also provides a method of determining the physiological effects of expressing varying levels of a human Y4 receptor which comprises producing a panel of transgenic nonhuman animals each expressing a different amount of the receptor.

This invention further provides a transgenic nonhuman mammal whose genome comprises antisense DNA complementary to DNA encoding a human Y4 receptor so placed as to be transcribed into antisense mRNA which is complementary to mRNA encoding the receptor and which hybridizes to mRNA encoding the receptor thereby preventing its translation.

This invention provides a metIod for determining whether a ligand not known to be capable of binding to the Y4 receptor can bind to the receptor which comprises contacting a mammalian cell comprising an isolated DNA molecule encoding the Y4 receptor with the ligand under conditions permitting binding of ligands known to bind to the receptor, detecting the presence of any of the ligand bound to the Y4 receptor, and thereby determining whether the ligand binds to the Y4 receptor.

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I ~~C~Pb JI L, -sl: i SWO 95/17906 PCTIUS94/14436 -11arief Description of the Fiqures Figure 1 Nucleotide Sequence and Deduced Amino Acid Sequence of a Novel Human hp25a Neuropeptide Receptor (Sequence I.D.

Nos. 1 and Nucleotides are presented in the 5' to 3' orientation and the coding region is numbered starting from the initiating methionine and ending in the termination codon. Deduced amino acid sequence by translation of a long open reading frame is shown, along with the 5' and 3' untranslated regions. Numbers in the left and right margins represent nucleotide (top line) and amino acid (bottom line) numberings, starting with the first position as -he adenosine and the initiating methionine respectively.

Figure 2 Sequence Alignment of the Human hp25a clone with human Y1, rat Yl, and mouse Y1 receptor genes. The deduced amino acid sequence of the human hp25a (Y4) receptor (first line), from the starting methionine to the stop codon is aligned with the human Y1 receptor clone (Larhanimar et al., 1992), rat Y1 receptor clone (Eva et al., 1990), and mouse Y1 receptor clone (Eva et al,, 1992). Hyphens represent added spaces necessary for proper alignment. Gray shading indicates residues in receptor clones which are identical to hp25a. Numbers above amino acid sequences correspond to amino acid positions of hp78a, starting with the initiating methionine and ending with the termination codon and including spaces to account for proper alignment.

Solid bars above the sequence indicate the seven putative transmembrane (TM) spanning regions (TM I VII).

Figure 3. Nucleotide se4uence and deduced amino acid sequence of the rat Y4 receptor encoded by rs36b a.

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a a -12- (Sequence ID. Nos 27 and 28). Nucleotides are presented in the 5' to 3' orientation and the coding region is numbered starting from the putative initiating methionine and ending in the termination codon. Deduced amiilo acid sequence by translation of a long open reading frame is shown, along with 5' and 3' untranslated regions. The amino acid sequence is represented using single-letter abbreviations.

Figure 4. Alignment of rat and human Y4 receptors.

Predicted amino acid sequences of the rat Y4 receptor (Y4rat) and human Y4 receptor (Y4hum) are shown; the sequences are 75% identical overall and 84% identical in the transmembrane domains. Single letter abbreviations for amino acids are shown. The seven putative transmembrane (TM) spanning regions (TM I VII) are indicated by brackets above the sequence.

Figure Equilibrium binding of 125 I-PYY to membranes from COS-7 cells transiently expressing hp25a receptors. Membranes were incubated with 25 I-PYY for the times indicated, in the presence or absence of 100 nM human PP. Specific binding, B, was plotted against time, t, to obtain the 25 maximum number of equilibrium binding sites, B t and observed association rate, Kbs, according to the equation, B Be (1 e-(kobs Binding is shown as the percentage of total equilibrium binding, determined by nonlinear regression analysis. Data are representative of three independent experiments, with each point measured in triplicate.

Figure 6A Saturable equilibrium binding of 25 I-PYY to membranes from 1 35 COS-7 cells transiently expressing hp25a receptors.

Membranes were incubated with 1 2 5I-PYY ranging in concentration from 0.003 nM to 2 tiM, in the presence or *000 *r a *4 0I *40 i 04 0r,, ar,.

WO 95/17906 PCT/US94/14436 -13absence of .00 nM human PP.

Figure 6B Specific binding of the "'I-PYY to membranes from COS-7 cells transiently expressing hp25a receptors under the conditions described in Figure 6A was plotted against the free 12 5 I-PYY concentration, to obtain t",e maximum number of saturable binding sites,Bmax, and the 125I-PYY equilibrium dissociation constant, Kd, according to the binding isotherm, B Bmax[L]/([L] Kd). Specific binding is shown for data from a representative of four independent experiments, with each point measured in quadruplicate.

Figure 7. Competitive displacement of 1 2 SI-PYY frow~ COS-7 cells transiently expressing hp25a receptors. Membranes were incubated with "'I-PYY and increasing concentrations of peptide competitors. IC 5 s values corresponding to displacement were determined by nonlinear regression analysis and converted to K i values according to the equation, K i ICso/(1 where is the 1 2

I-PYY

concentration and Kd is the equilibrium dissociation I constant of 1 "I-PYY. Data are representative of at least i two independent experiments, with each point measured once or in duplicate. Rank orders of affinity for these and other compounds are listed separately in Table 2.

i Figure 8. Inhibition of forskolin-stimulated cAMP accumulation in intact LM(tk-) cells stably expressing the human Y4 receptor. Functional data were derived from radioimmunoassay of cAMP in LM(tk-) cells stimulated with 10 AM forskolih over a 5 minute period. Human PP was tested for agonist activity at concentrations ranging from 0.03 pM to 0.3 AM over the same period. Data were fit to a four parameter logistic equation by nonlinear S reoFession. The data shown are representative of three o" r independent experimnnts.

Figures 9A and 9B. Figure 9A. Stimulation of intracellular free calcium concentration in intact LM(tkcells stably expressing the human Y4 receptor.

Representative time course. Functional data were derived from Fura-2/AM fluorescence in LM(tk-) cells stimulated with 100 nM human PP (open squares) or 100 nM human NPY (closed squares) at the time indicated by the arrow. The data shown are representative of two independent experiments. Figure 9B. Concentration/response curve.

Data were fit to a four parameter logistic equation by nonlinear regression."

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i I WO95/17906 PCTIUS94/14436 Detailed Description of the Invention Throughout this application, the following standard abbreviations are used to indicate specific nucleotide bases: C cytosine A adenine T thymine G guanine This invention provides isolated nucleic acid molecules which encode Y4 receptors. In one embodiment the Y4 receptor encoded is a rat Y4 receptor. In another embodiment, the Y4 receptor encoded is a human Y4 receptor. In an embodiment, the isolated nucleic acid molecule encodes a Y4 receptor being characterized by an amino acid sequence in the transmembrane region, wherein the amino acid sequence has 60% homology or higher to the amino acid sequence in the transmembrane region of the human Y4 receptor shown in Figure 2. In another embodiment, the Y4 receptor has substantially the same amino acid sequence as the human Y4 receptor as described in Figure 1. In yet another embodiment, the Y4 receptor has substantially the same amino acid sequence as the rat Y4 receptor as described in Figure 3. In another embodiment, the Y4 receptor has the amino acid sequence as shown in Figure 1. In another embodiment, the Y4 receptor has the amino acid sequence as shown in Figure 3. As used herein, the term Y4 receptor encompasses any amino acid sequence, polypeptide or protein having substantially the same pharmacology provided subject human Y4 receptor as shown in Tables 1-3 and Table 6 and Figures 5-7. As described herein the human Y4 receptor has a pharmacological profile that differs from any known neuropeptide Y receptor subtype Y1, Y2 and Y3), Neuropeptide YY receptor, and pancreatic polypeptide receptor, and is therefore designated as the human Y4 Sreceptor. |I

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.iL' .7i2 I_.l WO 95/17906 PCT/US94/14436 -16- The only NPY receptor which has been cloned to date is the Y1 receptor gene, from mouse (Eva et al., 1992), rat (Eva et al., 1990), and human (Larhammar et al., 1992).

The Y4 receptor's greatest homology with any known receptor disclosed in the Genbank/EMBL databases is a 42% overall amino acid identity with the human Y1 receptor.

This invention provides an isolated nucleic acid molecule encoding a Y4 receptor. In one embodiment, the Y4 receptor is a human Y4 receptor. In another embodiment, the Y4 receptor is a rat Y4 receptor. As used herein, the term "isolated nucleic acid molecule" means a nucleic acid molecule that is a molecule in a form which does not occur in nature. Examples of such an isolated nucleic acid molecule are an RNA, cDNA, or isolated genomic DNA molecule encoding a Y4 receptor. One means of isolating a human Y4 receptor is to probe a human genomic library with a natural or artificially designed DNA probe, using methods well known in the art. DNA probes derived from the human receptor gene Y4 are particularly useful probes for this purpose. DNA and cDNA molecules which encode human Y4 receptors may be used to obtain complementary genomic DNA, cDNA or RNA from human, mammalian or other animal sources, or to isolate related cDNA or genomic clones by the screening of cDNA or genomic libraries, by methods described in more detail below. Transcriptional regulatory elements from the 5' untranslated region of the isolated clones, and other stability, processing, transcription, translation, and tissue specificity-determining regions from the 3' and untranslated regions of the isolated genes are thereby obtained. Examples of a nucleic acid molecule are an RNA, cDNA, or isolated genomic DNA molecule encoding a Y4 receptor. Such molecules may have coding sequences such i as the coding sequences shown in Figures 1 or 3. The DNA molecule of Figure 1 encodes the amino acid sequence of a human Y4 receptor protein, while the DNA molecule of WO 95/17906 PCTJUS94/14436 -17-- Figure 3 encodes the amino acid sequence of the rat Y4 receptor.

This invention further provides a cDNA molecule encoding a Y4 receptor having a coding sequence substantially the same as the coding sequence shown in Figures 1 and 3.

This molecule is obtained by the means described above.

This invention also provides an isolated protein which is a Y4 receptor. In one embodiment, the Y4 receptor is a human Y4 receptor. In another embodiment, the Y4 receptor is a rat Y4 receptor. As used herein, the term "isolated protein" means a protein molecule free of other cellular components. An example of such a protein is an; isolated protein having substantially the same amino acid sequence as the amino acid sequence shown in Figure 1 which is a human Y4 receptor or the amino acid sequence shown in Figure 3 which is a rat Y4 receptor. One means for obtaining isolated Y4 receptor is to express DNA encoding the receptor in a suitable host, such as a bacterial, yeast, insect or mammalian cell, using methods well known in the art, and recovering the receptor protein after it has been expressed in such a host, again using methods well known in the art. The receptor may also be isolated from cells which express it, in particular from cells which have been transfected with the expression vectors described below in more detail.

This invention provides vectors comprising isolated nucleic acid molecules such as DNA, RNA, or cDNA encoding a. Y4 receptor. In one embodiment the Y4 receptor is a human Y4 receptor. In another embodiment the Y4 receptor is a rat Y4 receptor. Examples of vectors are viruses such as bacteriophages (such as phage lambda), animal viruses (such as Herpes virus, Murine Leukemia virus, and I Baculovirus), cosmids, plasmids (such as pUCI8, available from Pharmacia, Piscataway, NJ), and other recombination r t" meT1T rr c urT I i r 0= WO 9517906 PCTUS94/14436 -18vectors. Nucleic acid molecules are inserted into vector genomes by methods well known in the art. For example, insert and vector DNA can both be exposed to a restriction enzyme to create complementary ends on both molecules which base pair with each other and are then ligated together with a ligase. Alternatively, linkers can be ligated to the insert DNA which correspond to a restriction site in the vector DNA, which is then digested with the restriction enzyme which cuts at that site. Other means are also available. Specific examples of such plasmids are plasmids comprising cDNA having a coding sequence substantially the same as the coding sequence shown in Figure 1 and designated clone (Seq. I.D. No. 1) or the coding sequence shown in Figure 3 and designated clone rsl6b (Sequence I.D. No. 27).

This invention also provides vectors comprising DNA molecules encoding Y4 receptors, adapted for expression in a bacterial cell, a yeast cell, an insect cell or a mammalian cell which additionally comprise the regulatory elements necessary for expression of the DNA in the bacterial, yeast, insect or mammalian cells operatively linked to the DNA encoding a Y4 receptor as to permit expression thereof. DNA having coding sequences substantially the same as the coding sequence shown in Figure 1 may usefully be inserted into the vectors to express human Y4 receptors. DNA having coding sequences substantially the same as the coding sequence shown in Figure 3 may usefully be inserted into the vectors to express rat Y4 receptors. Regulatory elements required for expression include promoter sequences to bind RNA polymerase and transcription initiation sequences for ribosome binding. For example, a bacterial expression vector includes a promoter such as the lac promoter and for transcription initiation the Shine-Dalgarno sequence and the start codon AUG (Maniatis, et al., Molecular Cloning, Cold Spring Harbor Laboratory, 1982).

6hb _1-q .7 95/14436 19 IPEA/US 1 GJAN 1996 Similarly, a eukaryotic expression vector includes a heterologous or homologous promoter for RNA polymerase II, a downstream polyadenylation signal, the start codon AUG, and a termination codon for detachment of the ribosome. Furthermore, an insect expression vector, such as recombinant Baculovirus, uses the polyhedrin gene expression signals for expression of the inserted gene in insect cells. Such vectors may be obtained commercially or assembled from the sequences described by methods wll known in the art, for example the methods described above for constructing vectors in general. Expression vectors are useful to produce cells that express the receptor.

Certain uses for such cells are described in more detail below.

This invention further provides a plasmid adapted for expression in a bacterial, yeast, insect, or, in particular, a mammalian cell which comprises a DNA molecule encoding a Y4 receptor and the regulatory elements necessary for expression of the DNA in the bacterial, yeast, insect, or mammalian cell operatively linked to the DNA encoding a Y4 receptor as to permit expression thereof. Some plasmids adapted for expression in a mammalian cell are pSVL (available from Pharmacia, Piscataway, NJ) and pcEXV-3 (Miller J. and Germain R.N., J. Exp. Med. 164:1478 (1986)). A specific example of such plasmid is a plasmid adapted for expression in a mammalian cell comprising cDNA having coding sequences substantially the same as the coding sequence shown in Figure 1 and the regulatory elements necessary for expression of the DNA in the mammalian cell which is designated pcEXV-Y4 and deposited under ATCC Accession No. 75631, on December 23, 1993. Another example of such plasmid is a plasmid adapted for expression in a mammalian cell comprising cDNA having coding sequences substantially the same as the coding sequence shown in Figure 3 and the regulatory elements necessary for t 4 MiA u M iED SH EE 1 0 IPEA/US 16 JAN 196 expression of the DNA in the mammalian cell which is designated pcEXV-rY4, deposited under ATCC Accession No.

75984 on December 21, 1994. Those skilled in the art will readily appreciate that numerous plasmids adapted for expression in a mammalian cell which comprise DNA encoding Y4 receptors and the regulatory elements necessary to express such DNA in the mammalian cell may be constructed utilizing existing plasmids and adapted as appropriate to contain the regulatory elements necessary to express the DNA in the mammalian cell. The plasmids may be constructed by the methods described above for expression vectors and vectors in general, and by other methods well known in the art. The deposit discussed supra, and the other deposits discussed herein, were made pursuant to, and in satisfaction of, the Budapest Treaty on the International Recognition of the Deposit of Microorganisms for the Purpose of Patent Procedure with the American Type Culture Collection (ATCC), 12301 Parklawn Drive, Rockville, Maryland 20852.

This invention provides a csll comprising a nucleic acid encoding a Y4 receptor, such as a mammalian cell comprising a plasmid adapted for expression in a mammalian cell, which comprises a nucleic acid molecule encoding a Y4 receptor, the protein encoded thereby is expressed on the cell surface, and the regulatory elements necessary for expression of the nucleic acid in the mammalian cell operatively linked to the nucleic acid encoding a Y4 receptor as to permit expression thereof.

Numerous mammalian cells may be used as hosts, including, for example, the mouse fibroblast cell NIH-3T3, CHO cells, HeLa cells, LM(tk-) cells, Yi cells, etc.

Expression plasmids such as that described supra may be used to transfect mammalian cells by methods well known in the art such as calcium phosphate precipitation, or DNA encoding these Y4 receptors may be otherwise introduced into mammalian cells, by microinjection, l rur :\1 rl PCT/U 95/1443 6 -21- IPE US 1 6 JAN 1996 to obtain mammalian cells which comprise DNA, cDNA or a plasmid, encoding either Y4 receptor. In one embodiment, the LM(tk-) cell is designated L-hY4-3 (ATCC Accession No. CRL 11779). In another embodiment, the NIH-3T3 cell is designated N-hY4-5 (ATCC Accession No.

CRL 11778). Cell lines L-hY4-3 and N-hY4-5 were deposited with the ATCC on December 21, 1994.

This invention provides a method for determining whether a ligand can specifically bind to a Y4 receptor which comprises contacting a cell transfected with and expressing nucleic acid encoding the Y4 receptor with the ligand under conditions permitting binding of ligands to such receptor, and detecting the presence of any such ligand bound specifically to the Y4 receptor, thereby determining whether the ligand binds specifically to a Y4.

receptor. In one embodiment, the Y4 receptor is a human Y4 receptor. In another embodiment, the Y4 receptor is a rat Y4 receptor. This invention provides a method for determining whether a ligand can specifically bind to a Y4 receptor which comprises contacting a cell transfected with and expressing nucleic acid encoding the Y4 receptor with the ligand under conditions permitting binding of ligands to such receptor, and detecting the presence of any such ligand bound specifically to the Y4 receptor, thereby determining whether the ligand binds specifically to a Y4 receptor, wherein the Y4 receptor is characterized by an amino acid sequence in the transmebrane region, wherein the amino acid sequence has 60% homology or higher to the amino acid sequence in the transmembrane region of the human Y4 receptor shown in Figure 2. In one embodiment, the Y4 receptor is a human Y4 receptor. In another embodiment, the Y4 receptor is a rat Y4 receptor.

This invention provides a method for determining whether a ligand can bind specifically to a Y4 receptor which

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a~r~Lc WO95/17906 PCTIUS94/14436 WO 95/17906 -22comprises preparing a cell extract from cells transfected with and expressing nucleic acid encoding a Y4 receptor, isolating a membrane fraction from the cell extract, contacting the ligand with the membrane fraction under conditions permitting binding of ligands to such receptor, and detecting the presence of any ligand bound to the Y4 receptor, thereby determining whether the compound is capable of specifically binding to a Y4 receptor. In one embodiment, the Y4 receptor is a human Y4 receptor. In another embodiment, the Y4 receptor is a rat Y4 receptor.

This invention provides a method for determining whether a ligand is a Y4 receptor agonist which comprises contacting a cell transfected with and expressing nucleic acid encoding a Y4 receptor with the ligand under conditions permitting the activation of a functional Y4 receptor response from the cell, and detecting by means of a bioassay, such as a second messenger response, an increase in Y4 receptor activity, thereby determining whether the ligand is a Y4 receptor agonist. In one embodiment, the Y4 receptor is a human Y4 receptor. In another embodiment, the Y4 receptor is a rat Y4 receptor.

This invention provides a method for determining whether a ligand is a Y4 receptor agonist which comprises preparing a cell extract from cells transfected with and expressing nucleic acid encoding a Y4 receptor, isolating a membrane fraction from the cell extract, contacting the membrane fraction with the ligand under (onditions permitting the activation of a functional Y4 receptor response, and detecting by means of a bioassay, such as Sa second messenger response, an increase in Y4 receptor Sactivity, thereby dtermining whether the ligand is a Y4 receptor agonist. In one embodiment, the Y4 receptor is a human Y4 receptor. In another embodiment, the Y4 w receptor is a rat Y4 receptor.

j~b WO 95/17906 PCTUS94/14436 WO 95/17906 .sa -23- This invention provides a method for determining whether a ligand is a Y4 receptor antagonist which comprises contacting a cell trans.ected with and expressing nucleic acid encoding a Y4 receptor with the ligand in the presence of a known Y4 receptor agonist, such as PP, under conditions permitting the activation of a functional Y4 receptor response and detecting by means of a bioassay, such as a second messenger response, a decrease in Y4 receptor activity, thereby determining whether the ligand is a Y4 receptor antagonist. In one embodiment, the Y4 receptor is a human Y4 receptor. In another embodiment, the Y4 receptor is a rat Y4 receptor. This invention provides a method for determining whether a ligand is a Y4 receptor antagonist which comprises i! preparing a cell extract from cells transfected with and expressing nucleic acid encoding a Y4 receptor, isolating a membrane fraction from the cell extract, contacting the i membrane fraction with the ligand in the presence of a known Y4 receptor agonist, such as PP, under conditions permitting the activation of a functional Y4 receptor response and detecting by means of a bioassay, such as a second messenger response, a decrease in Y4 receptor activity, thereby determining whether the ligand is a Y4 receptor antagonist. In one embodiment, the Y4 receptor is a human Y4 receptor. In another embodiment, the Y4 receptor is a rat Y4 receptor.

In one embodiment of the above-described methods, the ligand is not previously known.

This invention provides a Y4 receptor agonist detected by |1 the above-described method. This invention provides a Y4 receptor antagonist detected by the above-described I method.

As used herein, the term "agonist" means any ligand WO 95/17906 PCTIUS94/14436 -24capable of increasing Y4 receptor activity. As used herein, the term "antagonist" means any ligand capable of decreasing Y4 receptor activity.

In one embodiment of the above-described methods, the cell is a mammalian cell. In a further embodiment, the cell is non-neuronal in origin. In another embodiment, the nonneuronal cell is a COS-7 cell, a CHO cell, an NIH- 3T3 cell or an LM(tk-) cell.

One method for determining whether a ligand is capable of binding to the human Y4 receptor comprises contacting a transfected nonneuronal cell a cell that does not naturally express any type of NPY, PP, or PYY receptor, thus will only express such a receptor if it is transfected into the cell) expressing a Y4 receptor on its surface, or contacting a membrane preparation derived from such a transfected cell, with the ligand under conditions which are known to prevail, and thus to be associated with, in vivo binding of the ligands to a Y4 receptor, detecting the presence of any of the ligand being tested bound to the Y4 receptor on the surface of the cell, and thereby determining whether the ligand binds to, activates or inhibits the activation of the Y4 receptor. A response system for detecting the activation or inhibition of activation of the Y4 receptor is obtained by transfection of isolated DNA into a suitable host cell containing the desired second messenger system such as phosphoinositide hydrolysis, adenylate cyclase, guanylate cyclase or ion channels. Such a suitable host cell system is isolated from pre-existing cell lines, or can be generated by inserting appropriate components of second messenger systems into existing cell lines. Such a transfection system provides a complete response system for investigation or assay of the activity of Y4 receptors with ligands as described above. Transfection S* systems are usefu as/ living cell cultures for 1( WO 95/17906 PCTYUS94/14436 -25- competitive binding assays between known or candidate drugs and ligands which bind to the receptor and which are labeled by radioactive, spectroscopic or other Sreagents. Membrane preparations containing the receptor isolated from transfected cells are also useful for these competitive binding assays. Functional assays of second messenger systems or their sequelae in transfection systems act as assays for binding affinity and efficacy in the activation of receptor function. A transfection system constitutes a "drug discovery system" useful for the identification of natural or synthetic compounds with potential for drug development that can be further modified or used directly as therapeutic compounds to activate or inhibit the natural functions of the Y4 receptor. The transfection system is also useful for determining the affinity and efficacy of known drugs at the Y4 receptor sites.

This invention also provides a method of screening drugs to identify drugs which specifically bind to a Y4 receptor on the surface of a cell which comprises contacting a cell transfected with and expressing nucleic acid encoding a Y4 receptor with a plurality of drugs, and .determining those drugs which bind to the cell, thereby identifying drugs which specifically bind to a Y4 receptor.

This invention also provides a method of screening drugs to identify drugs which specifically bind to a Y4 receptor on the surface of a cell which comprises preparing a cell extract from cells transfected with and expressing nucleic acid encoding a Y4 receptor, isolating a membrane fraction from the cell extract, contacting the membrane fraction with a plurality of drugs, and determining those drugs which bind to the membrane fraction, thereby identifying drugs which specifically bind to a Y4 receptor. i! SUBSTITUTE SHEET (RULE 26) WO PCT/US94/1443 6 WO 95/17906 This invention also provides a method of screening drugs to identify drugs which act as Y4 receptor agonists which comprises contacting a cell transfected with and expressing nucleic acid encoding a Y4 receptor with a plurality of drugs under conditions permitting the activation of a functional Y4 receptor response, determining those drugs which activate the Y4 receptor in the cell using a bioassay, such as a second messenger assay, thereby identifying drugs which act as Y4 receptor agonists.

This invention also provides a method of screening drugs to identify drugs which act as Y4 receptor agonists which comprises preparing a cell extract from cells transfected with and expressing nucleic acid encoding a Y4 receptor, isolating a membrane fraction from the cell extract, contacting the membrane fraction with a plurality of drugs under conditions permitting the activation of a functional Y4 receptor response, determining those drugs which activate the Y4 receptor in the cell using a bioassay, such as a second messenger assay, thereby identifying drugs which act as Y4 receptor agonists.

This invention also provides a method of screening drugs to identify drugs which act as Y4 receptor antagonists which comprises contacting a cell transfected with and expressing DNA encoding a Y4 receptor with a plurality of drugs in the presence of a known Y4 receptor agonist, such as PP, under conditions permitting the activation of a functional Y4 receptor response, and determining those drugs which inhibit the activation of the Y4 receptor in the cell using a bioassay, such as a second messenger assay, thereby identifying drugs which act as Y4 receptor antagonists.

This invention also provides a method of screening drugs to identify drugs which act as Y4 receptor antagonists which comprises preparing a cell extract from cells; r e% trlr Orb1 It fg M WO 95/17906 PCT/US94/14436 -27transfpnted with and expressing nucleic acid encoding a Y4 receptor, isolating a membrane fraction from the cell extract, contacting the membrane fraction with a plurality of drugs in the presence of a known Y4 receptor agonist, such as PP, under conditions permitting the activation of a functional Y4 receptor response, and determining those drugs which inhibit the activation of the Y4 receptor in the cell using a bioassay, such as a second messenger assay, thereby identifying drugs which act as Y4 receptor antagonists. A In one embodiment of the above-identified methods, the Y4 receptor is a human Y4 receptor. In another embodiment, j the Y4 receptor is a rat Y4 receptor. In one embodiment, the cell is a mammalian cell. In another embodiment, the mammalian cell is non-neuronal in origin. In a further embodiment, the mammalian cell non-neuronal in origin is a Cos-7 cell, a CHO cell, an LM(tk-) cell, a Y1 murine adrenal cell, or an NIH-3T3 cell.

The nucleic acid in the cell may have a coding sequence substantially the same as the coding sequences shown in Figures 1 and 3. Drug candidates are identified by choosing chemical compounds which bind with high affinity to the expressed Y4 receptor protein in transfected cells, using radioligand binding methods well known in the art, examples of which are shown in the binding assays described herein. Drug candidates are also screened for selectivity by identifying compounds which bind with high affinity to the Y4 receptor but do not bind with high affinity to any other NPY receptor subtype or to any other known receptor site. Because selective, high affinity compounds interact primarily with the i target Y4 receptor site after administration to the patient, the chances of producing a drug with unwanted 6, side effects are minimized by this approach.

I 4F~~ ILT 9 I 4 o- L; c~ I~YIY 111~ ~/1r WO 95/17906 PCT/US94/14436 -28- This inventon provides a pharmaceutical composition comprising a drug identified by the method described above and a pharmaceutically acceptable carrier. As used herein, the term "pharmaceutically acceptable carrier" encompasses any of the standard pharmaceutical carriers, such as a phosphate buffered saline solution, water, and emulsions, such as an.oil/water or water/oil emulsion, and various types of wetting agents. Once the candidate drug has been shown to be adequately bio-available following a particular route of administration, for example orally or by injection (adequate therapeutic concentrations must be maintained at the site of action for an adequate period to gain the desired therapeutic benefit), and has been shown to, be non-toxic and therapeutically effective in appropriate disease models, the drug may be administered to patients by that route of administration determined to make the drug bio-available, in an appropriate solid or solution formulation, to gain the desired therapeutic benefit.

This invention provides a nucleic acid probe comprising a nucleic acid molecule of at least 15 nucleotides capable of specifically hybridizing with a unique sequence included within the coding sequence of a nucleic acid molecule encoding a Y4 receptor, for example with a coding sequence included within the sequences shown in Figures I and 3. In one embodiment, the nucleic acid encodes a human Y4 receptor. In another embodiment, the nucleic acid encodes a rat Y4 receptor. As used herein, the phrase "specifically hybridizing" means the ability of a nucleic acid molecule to recognize a nucleic acid sequence complementary to its own and to form doublehelical segments through hydrogen bonding between complementary base pairs. As used herein, a "unique sequence" is a sequence specific to only the nucleic acid molecules encoding a Y4 receptor. Nucleic acid probe technology is well known to those skilled in the art who h nCCT~ C UI I i L J U ~IIIC~_~b- I WO 95/17906 PCTUS94/14436 -29will readily appreciate that such probes may vary greatly in length and may be labeled with a detectable label, such as a radioisotope or fluorescent dye, to facilitate detection of the probe. Detection of nucleic acid encoding human Y4 receptors is useful as a diagnostic test for any disease process in which levels of expression of the corresponding Y4 receptor is altered.

Nucleic acid probe molecules are produced by insertion of a nucleic acid molecule which encodes a Y4 receptor or fragments thereof into suitable vectors, such as plasmids or bacteriophages, followed by insertion into suitable

I

bacterial host cells and replication and harvesting of the nucleic acid probes, all using methods well known in the art. For example, the nucleic acid may be extracted i from a cell lysate using phenol and ethanol, digested with restriction enzymes corresponding to the insertion sites of the nucleic acid into the vector (discussed above), electrophoresed, and cut out of the resulting j gel. Example of such nucleic acid molecules are shown in h Figures 1 and 3. The probes are useful for 'in situ' hybridization or in order to locate tissues which express this gene family, or for other hybridization assays for the presence of these genes or their mRNA in various biological tissues. In addition, synthesized oligonucleotides (produced by a DNA synthesizer) complementary to the sequence of a DNA molecule which encodes a Y4 receptor of are useful as probes for these genes, for their associated mRNA, or for'the isolation of related genes by homology screening of genomic or cDNA libraries, or by the use of amplification techniques such as the Polymerase Chain Reaction. Synthesized oligonucleotides as described may also be used to determine the cellular localization of the mRNA produced by the Y4 gene by in situ hybridization.

This invention also provides a method of detecting i, expression of a Y4 receptor by detecting the presence of i SSTITTE SHFFT IrM11 F 7A WO95/17906 PCT/US94/14436 mRNA coding for a Y4 receptor which comprises obtaining total mRNA from the cell using methods well known in the art and contacting the mRNA so obtained with a nucleic acid probe comprising a nucleic acid molecule of at least 15 nucleotides capable of specifically hybridizing with a sequence included within the sequence of a nucleic acid molecule encoding a Y4 receptor under hybridizing conditions, and detecting the presence of mRNA hybridized to the probe, thereby detecting the expression of the Y4 receptor by the cell. Hybridization of probes to target nucleic acid molecules such as mRNA molecules employs techniques well known in the art. In one possible means of performing this method, nucleic acids are extracted by precipitation from lysed cells and the mRNA is isolated from the extract using a column which binds the poly-A tails of the mRNA molecules. The mRNA is then exposed to radioactively labelled probe on a nitrocellulose membrane, and the probe hybridizes to and thereby labels complementary mRNA sequences. Binding may be detected by autoradiography or scintillation counting. However, other methods for performing these steps are well known to those skilled in the art, and the discussion above is merely an example.

This invention provides an antisense oligonucleotide having a sequence capable of specifically hybridizing with any sequences of an mRNA molecule which encodes a Y4 receptor so as to prevent translation of the mRNA molecule. The antisense oligonucleotide may have a sequence capable of specifically hybridizing with any sequences of the cDNA molecule whose sequence is shown in Figure 1 or Figure 3. A particular example of an antisense oligonucleotide is an antisense oligonucleotide comprising chemical analogues of nucleotides.

This invention also provides a pharmaceutical composition comprising an amount of the oligonucleotide described i

I.

WO 95/17906 PCTUS94/14436 -31above effective to reduce activity of a human Y4 receptor by passing through a cell membrane and specifically binding with mRNA encoding a Y4 receptor in the cell so as to prevent its translation and a pharmaceutically acceptable carrier capable of passing through a cell membrane. The oligonucleotide may be coupled to a substance which inactivates mRNA, such as a ribozyme.

The pharmaceutically acceptable carrier capable of passing through cell membranes may also comprise a structuX- which binds to a receptor on a cell capable of being taken up by cells after binding to the structure.

The structure of the pharmaceutically acceptable carrier may be capable of binding to a receptor which is specific for a xelected cell type. The structure may be part of a protein known to bind a cell-type specific receptor, for example an insulin molecule, which would target pancreatic cells. Nucleic molecules having coding sequences substantially the same as the coding sequences shown in Figures 1 and 3 may be used as the oligonucleotides of the pharmaceutical composition, This invention also provides a method of treating an abnormality wherein the abnormality is alleviated by decreasing the activity of a Y4 receptor which comprises administering to a subject an amount of the pharmaceutical composition described above effective to decrease the activity of the Y4 receptor. Several examples of such abnormal conditions are amnesia, anxiety, epilepsy, pain, hypertension, locomotor problems, circadian rhythm disorders, eating/body weight disorders, sexual/reproductive disorders, nasal congestion, diarrhea, gastrointestinal and cardiovascular disorders, and sleep and eating disorders.

Antisense oligonucleotide drugs inhibit translation of mRNA encoding these receptors. Synthetic oligonucleotides, or other antisense chemical structures I a, M%lirr r n ,r ,r n&l.

I- .WO 95/17906 PCT/US94/14436 -32are designed to bind to mRNA encoding the Y4 receptor and inhibit translation of mRNA and are useful as drugs to inhibit expression of Y4 receptor genc; in patients.

This invention provides a means to therapeutically alter levels of expression of human Y4 receptors by the use of a synthetic antisense oligonucleotide drug (SAOD) which inhibits translation of mRNA encoding these receptors.

Synthetic oligonucleotides, or other antisense chemical structures designed to recognize and selectively bind to mRNA, are constructed to be complementary to portions of the nucleotide sequences shown in Figures 1 and 3 of DNA, RNA or of chemically modified, artificial nucleic acids.

The SAOD is designed to be stable in the blood stream for administration to patients by injection, or in laboratory cell culture conditions, for administration to cells i removed from the patient. The SAOD is designed to be capable of passing through cell membranes in order to enter the cytoplasm of the cell by virtue of physical and chemical properties of the SAOD which render it capable of passing through cell membranes by designing small, hydrophobic SAOD chemical structures) or by virtue of specific transport systems in the cell which recognize and transport the SAOD into the cell. In addition, the SAOD can be designed for administration only to certain selected cell populations by targeting the SAOD to be recognized by specific cellular uptake mechanisms which binds and takes up the SAOD only within certain selected cell populations. For example, the SAOD may be designed to bind to a receptor found only in a certain cell type, as discussed above. The SAOD is also designed to recognize and selectively bind to the target mRNA sequence, which may correspond to a sequence contained within the sequences shown in Figures 1 and 3 by virtue of complementary base pairing to the mRNA. Finally, the SAOD is designed to inactivate the target mRNA sequence by any of three mechanisms: 1) by binding to the target mRNA and thus inducing degradation of the mRNA by q)t MTr ITF qHFFT MIuLE 26) WO 95/17906 PCTUS94114436 -33intrinsic cellular mechanisms such as RNAse I di-estion, 2) by inhibiting translation of the mRNA target by interfering with the binding of translation-regulating factors or of ribosomes, or 3) by inclusion of other chemical structures, such as ribozyme sequences or reactive chemical groups, which either degrade or chemically modify the target mRNA. Synthetic antisense oligonucleotide drugs have been shown to be capable of the properties described above when directed against mRNA targets Cohen, Trends in Pharm. Sci. 10, 435 (1989); H.M. Weintraub, Sci. Am. January (1990) p. In addition, coupling of ribozymes to antisense oligonucleotides is a promising strategy for inactivating target mRNA Sarver et al., Science 247, 1222 (1990)).

An SAOD serves as an effective therapeutic agent if it is designed to be administered to a patient by injection, or if the patient's target cells are removed, treated with j the SAOD in the laboratory, and replaced in the patient.

In this manner, an SAOr serves as a therapy to reduce receptor expression in particular target cells of a I patient, in any clinical condition which may benefit from reduced expression of Y4 receptors.

This invention provides an antibody directed to a Y4 receptor, for example a monoclonal antibody directed to an epitope of a Y4 receptor present on the surface of a cell and having an amino acid sequence substantially the same as an amino acid sequence for a cell surface epitope of the human Y4 receptor included in the amino acid sequence shown in Figure 1 (Seq. I.D. No. 2) or the rat.

Y4 receptor included in the amino acid sequence shown in Figure 3 (Seq.I.D. No. 28). Amino acid sequences may be analyzed by methods well known in the art to determine whether they produce hydrophobic or hydrophilic regions in the proteins which they build. In the case of cell membrane proteins, hydrophobic regions are well known to Sform the part of the protein that is inserted into the .WO 95/17906 PCTIUS94/14436 -34lipid bilayer which forms the cell membrane, h'.ile hydrophilic regions are located on the cell surface, in an aqueous environment. Therefore antibodies to the hydrophilic amino acid sequences shown in Figures 1 and 3 will probably bind to a surface epitope of a human or rat Y4 receptor, respectivley, as described. Antibodies directed to Y4 receptors may be serum-derived or monoclonal and are prepared using methods well known in the art. For example, monoclonal antibodies are prepared using hybridoma technology by fusing antibody producing B cells from immunized animals with myeloma cells and selecting the resulting hybridoma cell line producing the desired antibody. Cells such as COS-7 cells or LM(tk-) cells comprising DNA encoding the human Y4 receptor and thereby expressing the human Y4 receptor may be used as immunogens to raise such an antibody. Alternatively, synthetic peptides may be prepared using commercially available machines and the amino acid sequences shown in Figures 1 and 3 (Seq. I.D. Nos. 2 and 28). As a still further alternative, DNA, such as a cDNA or a fragment thereof, may be cloned and expressed and the resulting polypeptide recovered and used as an immunogen. These antibodies are useful to detect the presence of human Y4 receptors encoded by the isolated DNA, or to inhibit the function of the receptors in living animals, in humans, or in biological tissues or fluids isolated from animals or humans.

This invention provides a pharmaceutical composition which comprises an amount of an antibody directed to the human Y4 receptor effective to block binding of ligands to the Y4 receptor, and a pharmaceutically acceptable carrier. A monoclonal antibody directed to an epitope of a Y4 receptor present on the surface of a cell and having an amino acid sequence substantially the same as an amino acid sequence for a cell surface epitope of the Y4 receptor included in the amino acid sequences shown in PI ,?r1 wrr imb I fI l WO9517906 PCTUS94/14436 WO 95/17906 i Figures 1 and 3 is useful for this purpose. In one embodiment, the Y4 receptor is a human Y4 receptor. In another embodiment, the Y4 receptor is a rat Y4 receptor.

This invention also provides a method of treating an abnormality wherein the abnormality is alleviated by decreasing the activity of a Y4 receptor which comprises administering to a subject an amount of the pharmaceutical composition described above effective to block binding of ligands to the Y4 receptor, thereby treating the abnormality. Binding of the antibody to the receptor prevents the receptor from functioning, thereby neutralizing the effects of Y4 receptor activity. The monoclonal antibodies described above are both useful for this purpose. Some examples of abnormalities are amnesia, depression, anxiety, epilepsy, pain, depression, hypertension, and sleep and eating disorders.

This invention provides a method of detecting the presence of a Y4 receptor on the surface of a cell which comprises contacting the cell with an antibody directed to the Y4 receptor, under conditions permitting binding of the antibody to the receptor, and detecting the presence of the antibody bound to the cell, thereby detecting the presence of the Y4 receptor on the surface of the cell. Such a method is useful for determining whether a given cell is defective in activity of Y4 receptors on the surface of the cell. Bound antibodies are detected by methods well known in the art, for example by binding fluorescent markers to the antibodies and examining the cell sample under a fluorescence microscope to detect fluorescence on a cell indicative of antibody binding. The monoclonal antibodies described above are useful for this purpose.

This invention provides a transgenic nonhuman mammal expressing nucleic acid encoding a Y4 receptor. This 1' I i 411 r WO 95/17906 PCT/US94/14436 -36invention also provides a transgenic nonhuman mammal comprising a homologous recombination knockout of the native Y4 receptor. This invention also provides a transgenic nonhuman mammal whose genome comprises antisense DNA complementary to DNA encoding a Y4 receptor so placed as to be transcribed into antisense mRNA which is complementary to mRNA encoding a Y4 receptor and which hybridizes to mRNA encoding a Y4 receptor thereby reducing its translation. The DNA may additionally comprise an inducible promoter or additionally comprise tissue specific regulatory elements, so that expression can be induced, or restricted to specific cell types.

Examples of DNA are DNA or cDNA molecules having a coding sequence substantially the same as the coding sequences shown in Figures 1 and 3. An example of a transgenic animal is a transgenic mouse. Examples of tissue specificity-determining regions are the metallothionein promotor (Low, Lechan, Hammer, R.E. et al.

Science 231:1002-1004 (1986)) and the L7 promotor (Oberdick, Smeyne, Mann, Jackson, S. and Morgan, J.I. Science 248:223-226 (1990)).

Animal model systems which elucidate the physiological and behavioral roles of Y4 receptors are produced by creating transgenic animals in whi-h the activity of a Y4 receptor is either increased or decreased, or the amino acid sequence of the expressed Y4 receptor protein is altered, by a variety of techniques. Examples of these techniques include: 1) Insertion of normal or mutant versions of DNA encoding a Y4 receptor or homologous animal versions of these genes, by microinjection, retroviral infection or other means well known to those skilled in the art, into appropriate fertilized embryos in order to produce a transgenic animal (Hogan B. et al.

Manipulating the Mouse Embryo, A Laboratory Manual, Cold Spring Harbor Laboratory (1986)). 2) Homologous recombination (Capecchi M.R. Science 244:1288-1292 i S .WO 95/17906 PCT/US94/14436 -37- (1989); Zimmer, A. and Gruss, P. Nature 338:150-153 (1989)) of mutant or normal, human or animal versions of these genes with the native gene locus in transgenic animals to alter the regulation of expression or the structure of these Y4 receptors. The technique of homologous recombination is well known in the art. It replaces the native gene with the inserted gene and so is useful for producing an animal that cannot express native receptor but does express, for example, an inserted mutant receptor, which has replaced the native receptor in the animal's genome by recombination, resulting in underexpression of the receptor. Microinjection adds genes to the genome, but does not remove them, and so is useful for producing an animal which expresses its own and added receptors, resulting in overexpression of the receptor. One means available for producing a transgenic animal, with a mouse as an example, is as follows: Female mice are mated, and the resulting fertilized eggs are dissected out of their oviducts. The eggs are stored in an appropriate medium such as M2 medium (Hogan B. et al. Manipulating the Mouse Embryo, A Laboratory Manual, Cold Spring Harbor LLboratory (1986)). DNA or cDNA encoding a human Y4 receptor is purified from a vector (such as plasmid pcEXV-Y4 described above) by methods well known in the art. Inducible promoters may be fused with the coding region of the DNA to provide an experimental means to regulate expression of the transgene. Alternatively or in addition, tissue specific regulatory elements may be fused with the coding region to permit tissue-specific expression of the trans-gene.

SThe DNA, in an appropriately buffered solution, is put into a microinjection needle (which may be made from capillary tubing using a pipet puller) and the egg to be injected is put in a depression slide. The needle is inserted into the pronucleus of the egg, and the DNA solution is injected. The injected egg is then transferred into the oviduct of a pseudopregnant mouse (a y; SltMSTlITTF SHEET (ROLE 261 n pLCP L WO 95/17906 PCTUS94/14436 -38mouse stimulated by the appropr 4 hormones to maintain pregnancy but which is not actually pregnant), where it proceeds to the uterus, implants, and develops to term.

As noted above, microinjection is not the only method for inserting DNA into the egg cell, and is used here only for exemplary purposes.

Since the normal action of receptor-specific drugs is to activate or to inhibit receptor activity, the transgenic animal model systems described above are useful for testing the biological activity of drugs directed against these Y4 receptors even before such drugs become available. These animal model systems are useful for predicting or evaluating possible therapeutic j applications of drugs which activate or inhibit Y4 receptor activity by inducing or inhibiting expression of the native or trans-gene and thus increasing or decreasing activity of normal or mutant Y4 receptors in the living animal. Thus, a model system is produced in which the biological activity of drugs directed against these Y4 receptors are evaluated before such drugs become available. The transgenic animals which have increased or decreased Y4 receptor activity indicate by their physiological state whether increase or decrease of the Y4 receptor activity is therapeutically useful. It is therefore useful to evaluate drug action based on the transgenic model system. One use is based on the fact that it is well known in the art that a drug such as an antidepressant acts by blocking neurotransmitter uptake, and thereby increases the amount of neurotransmitter in the synaptic cleft. The physiological result of this action is to stimulate the production of less receptor by the affected cells, leading eventually to decreased activity of the receptor. Therefore, an animal which has |1 decreased receptor activity is useful as a test system to investigate whether the actions of such drugs which IR result in decreased receptor activity are in fact Me IrI-9- inW Is 9O Oe% s~ss~ WO95/17906 PCTIUS94/14436 -39- therapeutic. Another use is that if increased receptor activity is found to lead to abnormalities, then a drug which down-regulates or acts as an antagonist to Y4 receptor is indicated as worth developing, and if a promising therapeutic application is uncovered by these animal model systems, activation or inhibition of Y4 receptor activity is achieved therapeutically either by producing agonist or antagonist drugs directed against these Y4 receptors or by any method which increases or decreases the activity of these Y4 receptors.

This invention provides a method of determining the physiological effects of expressing varying levels of human Y4 receptors which comprises producing a transgenic nonhuman animal whose levels of human Y4 receptor P activity are varied by use of an inducible promoter which regulates Y4 receptor expression. This invention also provides a method of determining the physiological effects of expressing varying levels of Y4 receptors which comprises producing a panel of transgenic nonhuman animals each expressing a different amount of Y4 receptor activity. Such animals may be produced by introducing different amounts of nucleic acid encoding a Y4 receptor into the oocytes from which the transgenic animals are developed.

This invention also provides a method for identifying F Y4 receptor antagonist capable of alleviating an abnormality in a subject,wherein the abnormailty is alleviated by decreasing the activity of a Y4 receptor which comprises administering the antagonist to a transgenic nonhuman mammal expressing least one artificially introduced nucleic acid molecule encoding a Y4 receptor and determining whether the antagonist alleviates the physical and behavioral abnormalities displayed by the transgenic nonhuman mammal as a result of activity oJ a Y4 receptor, thereby identifying a Y4

(I

~~dlL _F-l~ WO 95/17906 PCT/US94/14436 1 receptor antagonist. As used herein, the term "antagonist" means a compound or composition which may be natural, synthetic, or a product derived from screening.

Examples of nucleic acid molecules are DNA, cDNA., genomic DNA, synthetic DNA or RNA molecules having coding sequences substantially the same as the coding sequences shown in Figures 1 and 3. This invention also provides an antagonist identified by the mehtod described above.

This invention provides a pharmaceutical composition comprising an amount of the antagonist described supra and a pharmaceutically acceptable carrier.

This invention further provides a method for treating an abnormality in a subject wherein the abnormality is alleviated by decreasing the activity of a Y4 receptor which comprises administering to the subject an effective amount of the pharmaceutical composition described above, thereby treating the abnormality.

This invention provides a method for identifying a Y4 receptor agonist capable of alleviating an abnormality in a subject wherein the abnormality is alleviated by activation of a Y4 receptor which comprises administering the agonist to the transgenic nonhuman mammals described above determining whether the agonist alleviates the physical and behavioral abnormalities displayed by the transgenic nonhuman mammal, the alleviation of the abnormality indicating the identification of a Y4 receptor agonist.

This invention provides an agonist identified by the method described above.

This invention also provides a pharmaceutical composition comprising an amount of 'the agonist identified by the method described above and a pharmaceutically acceptable l, meTITInm: rCUC LCT I F M 1:, -n WO 95/17906 PCT/US94/14436 -41carri.er.

This invention further provides a method for treating an abnormality in a subject wherein the abnormailty is alleviated by activation of a Y4 receptor which comprises administering to a subject an effective amount of the pharmaceutical composition described above, thereby treating the abnormaility, This invention provides a method for diagnosing a predisposition to a disorder associated with the activity of a specific Y4 receptor allele which comprises: a) obtaining DNA of subjects suffering from the disorder; b) performing a restriction digest of the DNA with a panel i of restriction enzymes; c.electrophoretically separating the resulting DNA fragments on a sizing gel; d) contacting the resulting gel with a nucleic acid probe capable of specifically hybridizing to DNA encoding a Y4 receptor and labelled with a detectable marker; e) detecting labelled bands which have hybridized to the DNA encoding a Y4 receptor labelled with a detectable marker to create a unique band pattern specific to the DNA of subjects suffering from the disorder; f) preparing DNA obtained for diagnosis by steps a-e; and g) comparing the unique band pattern specific to the DNA of subjects suffering from the disorder from step e and the DNA obtained for diagnosis from step f to determine whether the patterns are the same or different and thereby to diagnose predisposition to the disorder if the patterns are the same. This method may also be used to diagnose a disorder associated with the expression of a specific Y4 receptor allele.

This invention provides a method of preparing the purified, isolated Y4 receptor which comprises a) constructing a vector adapted for expression in a cell which comprises the regulatory elements necessary for the i .WO 95/17906 PCTUS94/14436 -42expressin of nucleic acid in the cell operatively linked to the nucleic acid encoding a Y4 receptor as to permit expression thereof, wherein the cell is selected from the group consisting of bacterial cells, yeast cells, insect cells and mammalian cells; b) inserting the vector of step a in a suitable host cell; c) incubating the cells of step b under conditions allowing the expression of a Y4 receptor; d) recovering the receptor so produced; and e) purifying the receptor so recovered, thereby preparing the purified, isolated Y4 receptor. An example of an isolated Y4 receptor is an isolated protein having substantially the same amino acid sequence as-the amino acid sequences shown in Figures 1 and 3. For example, cells can be induced to express receptors by exposure to substances such as hormones. The cells can then be homogenized and the receptor isolated from the homogenate using an affinity column comprising, for example, PP or another substance which is known to bind to the receptor.

Vi AI The resulting fractions can then be purified by contacting them with an ion exchange column, and determining which fraction contains receptor activity or binds anti-receptor antibodies. This method for preparing Y4 receptor uses recombinant DNA technology methods well known in the art. For example, isolated nucleic acid encoding Y4 receptor is inserted in a suitable vector, such as an expression vector. A suitable host cell, such as a bacterial cell, or a eukaryotic cell such as a yeast cell, is transfected with the vector. Y4 receptor is isolated from the culture medium by affinity purification or by chromatography or by other methods well known in the art.

This invention identifies for the first time a new receptor protein, its amino acid sequence, and its human gene. Furthermore, this invention describes a previously unrecognized group of receptors within the definition of a Y4 receptor. The information and experimental tools WO 95/17906 PCT/US94/1443 6

L

-43- i provided by this discovery are useful to generate new therapeutic agents, and new therapeutic or diagnostic assays for this new receptor protein, its associated mRNA molecule or its associated genomic DNA. The information and experimental tools provided by this discovery will be useful to generate new therapeutic agents, and new therapeutic or diagnostic assays for this new receptor protein, its associated mRNA molecule, or its associated genomic DNA.

Specifically, this invention relates to the first isolation of a human and a rat genomic clone encoding a Y4 receptor. A new human gene for the receptor identified herein as Y4 has been identified and characterized. In addition, the human Y4 receptor has been expressed in COS-7 cells. The pharmacological binding properties of the protein encoded have been determined, and these binding properties classify this protein as a novel NPY/PYY/PP receptor which we designate as a Y4 receptor. Mammalian cell lines expressing this I Y4 receptor at the cell surface have been constructed, thus establishing the first well-defined, cultured cell lines with which to study this Y4 receptor.

This invention will be better understood by reference to the Experimental Details which follow, but those skilled in the art will readily appreciate that the specific experiments detailed are only illustrative of the invention as described more fully in the claims which follow thereafter. i: 1 I !1s *WO 95/17906 PTU9/43 -44- Experimental Details Cloning and Sequencing of a human (Y4) Neuropeptide Receptor. A human placenta genomic library in X dash II x 106 total recombinants; Stratagene, LaJolla, CA) was screened using overlapping transmembrane (TM) oligonucleotide probes (TM 1, 2, 3, 5 and 7) derived from the rat Yl neuropeptide receptor gene (Eva, C. et al., 1990; Ge~nBank accession No. Z11504) Overlapping oligomer; (TM1: nts. 198-251, TTGCTTATGGGGCTGTGATTATTCTTGGGGTCTCTGGAAACCTGG -3' (Sequence I.D. No. 3) and (-strand/5' TAGGATGATTATGATCAATGCCAGGTTTCCAGAGACCCCAAGAAT- 3' (Sequence I.D. No. TM2: nts. 269-328, (+)strand/51-

AAAGAGATGAGGAATGTCACCAACATTCTGATCGT

GAACCTCTCC-31 (Sequence I.D. No. 5) and CAGCAAGTCTGAGAAGGAGAGGTTCACGATCAGAATGTrTGGTGAC-3' (Sequence I.D. No. TM3: nts. 401-478, TGCAAACTGAATCCTTTTGTGCATGCGTCTCCATTACAGTATCCATTTTCTCT-3' (Sequence I.D. No. 7) and GATGAGAACCAGAGAGAAAATGGATACTGTAATGGAGACGCA- 3' (Sequence I.D. No. TM5: nts. 716-778, CTGCAGTATTTTGGCCCACTCTGTTTCATATTCATATGCTAC-3' (Sequence 1 No. 9) a nd strand/5' CAAGCGAATGTATATCTTGAAGTAGCATATGAATATGAAACA- 3' (Sequence I.D. No. 10); TM7: nts. 971-1045,

CTGCTCTGCCACCTCACGGCCATGATCTCCACCTGCGTCAACC

I CCATC-31 (Sequence I.D. No. 11) and (-)strand/51-

GAAATTTTTGTTCAGGAATCCATAAAAGATGGGGTTGA

CGCAGGTGGA-31 (Sequence I.D. No. 12); GenBank accession No. Z11504) were labeled with 2 )dATP and 3 P~dCTP by synthesis with the large fragment of DNA polymerase,.

Hybridization was performed at low stringency conditions,,.

400C. in a solution containing 25.0!k formamide, 5x SSC (lx sSC is 0. IBM sodium chloride, 0.015SM sodium citrate), ix Denhardt's solution (0.02!k polyvinylpyrrolindone, a a.

a aL a .e.

a a a aa a a a o a aa a Ficoll, 0.02% bovine serum albumin), and 25 pg/Al sonicated salmon sperm DNA. The filters were washed at 0 C. in 0.1x SSC containing 0.1% sodium dodecyl sulfate and exposed at -70 0 C. to Kodak XAR film in the presence of an intensifying screen. Lambda phage clones hybridizing with the probes were plaque purified and DNA was prepared for Southern blot analysis (Southern, 1975; Sambrook et al., 1989). A Genomic clone hybridizing with all five of the rat Y1 TM probes, designated was isolated using this method. For subcloning and further Southern blot analysis, the hp25a DNA was cloned into pUC18 (Pharmacia, Piscataway, NJ). Nucleotide sequence analysis was accomplished by the Sanger dideoxy nucleotide chain termination method (Sanger et al., 1977) on denatured double-stranded plasmid templates, using Sequenase (US Biochemical Corp., Cleveland, OH).

Cloning and Sequencing of a rat NPY (Y4) neuropeptide receptor: A rat spleen genomic library (Stratagene, La Jolla, CA) was screened using overlapping TM oligonucleotide probes (TM 1 7) derived from the nucleotide sequences corresponding approximately to the TM regions of the amino acid sequence of the human Y4 receptor as shown in Figure 2. The overlapping oligomers used were as follows: TMI: nts. #129-201, GGGTCCTGGGT (Sequence I.D. No. 13)and CCCCACGACAG (Seq. I.D. No. 14); TM2: nts. #234-303, s t r a n d 5 TGCTTATCGCCAACCTGGCCTTCTCTGACTTCCTCATGTGCCTCC (Seq.

I.D. No. 15) and s t r a n d 5 TAGACGGCGGTCAGCGGCTGGCAGAGGAGGCACATGAGGAAGTCA (Seq.

I.D. No. 16); ik -46- TM3: nts. #348-417, )s t r a n d

TGTCGGCCTTCATCCAGTGCATGTCGGTGACGGTCTCCATCCTCT

I.D. No. 17) and )s t r a n d

CTCTCCAGGGCCACGAGGACGAGCGAGAGGATGGAGACCGTCACC

I.D. No. 18); TM4: nts. #467-536, )s t r a n d 5

GCCTACCTGGGGATTGTGCTCATCTGGGTCATTGCCTGTGTCCTC

I.D. No. 19) and )s t r a n d 5

TGCTGTTCGCCAGGAAGGGCAGGGAGAGGACACAGGCAATGACCC

I.D. No. nts. #637-706, )s t r a n d 5

CATCTACACCACCTTCCTGCTCCTCTTCCAGTACTGCCTCCCACT

I.D. No. 21) and (Seq.

(Seq.

I (Seq.

I (Seq.

I (Seq.

09 9 9 09 0 9*0.e 9 o *9 0 9 99* 5 4 9.

0 9 944 9 @099w 9 9,9 S 9 99 9 .9.4 99 9* 9 0 9 *0 )s t r a n d 5 1 TGCATAACAGACCAGGATGAAGCCCAGTGGGAGGCAGTACTGGAA (Seq.

I.D. No. 22); TM6: nts. #800-870, strand/5' -CTGGTGGTGATGGTGGTGGCCTTTGCCGTGCTCT GGCTGCCTCTGC (Seq. I.D. No. 23) and )s t r a n d CAGTCTTCCAGGCTGTTGAACACATGCAGAGGCAGCCAGAGCACG (Seq.

I.D. No. 24); TM7: NTS. #908-977, )s t r a n d ATCTTCTTAGTGTGCCACTTGCTTGCCATGGCCTCCACCTGCGTC (Seq.

I.D. No. 25) and )s t r a n d 5 TGAGAbAAGCCATAGATGAATGGGTTGACGCAGGTGGAGGCCATGG (Seq.

I.D. No. 26) were labeled with L2KPl-ATP and (V'P)-CTP by synthesis with the large fragment of DNA polymerase. Hybridization was performed at reduced stringency conditions: 40 0 C in a solution 99 *4 9 99*4 (;P1LTh WO 95/17906 PCTIUS94/14436 -47containing 37.5% formamide, 10% dextrani sulfate, SSC, 1X Denhardt's solution, and 100 Ag/ml of sonicated salmon sperm DNA. The filters were washed at 45 0 C in 0.1X SSC containing 0.1% sodium dodecyl sulfate (SDS) and exposed at -70 0 C to Kodak XAR film in the presence of an intensifying screen. Lambda phage clones hybridizing to the probes were plaque purified by successive plating and rescreening. A genomic clone hybridizing with all seven human Y4 receptor TM probes, designated rsl6b, was isolated using this method. For expression and sequence analysis, a 2.0 kb BamHI/HindIII fragment of rsl6b was subcloned into the corresponding polylinker sites of a pcEXV-3 eukaryotic expression vector (Miller and Germain, 1986) modified to include a polylinker with EcoRI, SstI, Clal, KpnI, SmaI, 'baI, BamHI, SalI and HindIII restriction sites and designated EXJ.RH. Nucleotide sequence analysis was accomplished by the Sanger dideoxy nucleotide chaintermination method (Sanger, 1977) on double stranded plasmid templates, using Sequenase Biochemical Corp., Cleveland, Ohio).

Transient Transfection: The entire coding region of hp25a (1127 bp), including 680 bp of 5' untranslated UT) and 205 bp of 3' untranslated sequence UT), was cloned into the BamHI and EcoRI sites of the polylinkermodified eukaryotic 'expression vector pCEXV-3 (Miller et al., 1986), called EXJ.HR unpublished data).

Monkey kidney cells (Cos-7) were transiently transfected with plasmid hp25a/EXJ (expression vector containing the receptor gene) using DEAE dextran methodology (reagents obtained from Specialty Media, Lavellette, NJ) The'plasmid rsl6b/EXJ (the expression vector containing n. lamtrr mr ~r rru i-i ii i -LL WO 95/17906 PCT/US94/14436 -48the rsl6b receptor gene), was transiently triinsfected into Cos-7 cells using similar methods, as were the human Y1 receptor (Larhammar, 1992) and the human Y2 receptor.

The cloned Y2 receptor was disclosed in U.S. patent application 08/192,288 filed on February 2, 1994, currently pending, the foregoing contents of which are hereby incorporated by reference.

Stable Transfection Human Y4 receptors were co-transfected with a G-418 resistant gene into the mouse embryonic NIH-3T3 cell line by a calcium phosphate transfection method (Cullen, 1987). Stably transfected cells were selected with G- 418. Human Y4 receptors were similarly transfected into mouse fibroblast LM(tk-) cells.

Cell culture: COS-7 cells were grown on 150 mm plates (Corning) in D-MEM with supplements (Dulbecco's Modified Eagle Medium with 10% bovine calf serum, 2 mM glutamine, 100 units/ml penicillin/80 units/ml streptomycin) at 37 oC, 5% CO 2 Stock plates of COS-7 cells were trypsinized and split 1:6 every 3-4 days. SK-N-Be(2) human neuroblastoma cells were grown similarly in 225 cm 2 flasks (Co-star) using 50% Eagle's Modified Essential Media, Ham's Nutrient Mixture F-12, 15% fetal bovine serum, 2 mM glutamine, 100 units/ml penicillin/80 units/ml streptomycin, and 1% non-essential amino acids. Stock flasks of SK-N-Be(2) cells were trypsinized and split 1:10 every 7 days.

Mouse embryonic NIH-3T3 cells were grown on 150 mm plates in Dulbecco's Modified Eagle Medium (DMEM) with supplements (10% bovine calf serum, 4 mM glutamine, 100 units/ml penicillin/100 Ag/ml streptomycin) at 37

CO

2 Stock plates of NIH-3T3 cells were trypsinized and split 1:15 every 3-4 days. Mouse fibroblast LM(tk-) WO 95/17906 PCTIUS94/14436 -49cells were grown on 150 mm plates in Dulbecco's Modified Eagle Medium (DMEM) with supplements (10% bovine calf serum, 4 mM glutamine, 100 units/ml penicillin/100 gg/ml streptomycin) at 37 OC, 5% CO,. Stock plates of LM(tk-) cells were trypsinized and split 1:10 every 3-4 days.

Cell culture media and supplements were from Specialty Media (Lavallette, NJ). Cell culture plates (150 mm) were from Corning (Corning, NY). Cell culture flasks (225 cm 2 and polypropylene microtiter plates were from Co-star (Cambridge, MA).

Membrane Harvest: Membranes were harvested from COS-7 cells 48 hours after transfection and from SK-N-Be(2) seven days after splitting. Adherent cells were washed twice in ice-cold phosphate buffered saline (138 mM NaC1, 8.1 mM NaHPO 4 2.5 mM KC1, 1.2 mM KHPO 4 0.9 mM CaCl 2 mM MgCl 2 pH 7.4) and lysed by sonication in ice-cold hypotonic buffer (20 mM Tris-HCl, 5 mM EDTA, pH 7.7).

Large particles and debris were cleared by low speed centrifugation (200 x g, 10 min, 4 oC). Membranes were collected from the supernatant fraction by high speed centrifugation (32,000 x g, 18 min, 4 OC), washed with ice-cold hypotonic buffer, and collected again by high speed centrifugation (32,000 x g, 18 min, 4 The final membrane pellet was resuspended by sonication into a small volume (-500 il) of ice-cold binding buffer (10 mM NaC1, 20 mM HEPES, 0.22 mM KH 2

PO

4 1.26 mM CaC1 2 0.81 mM MgSO 4 pH Protein concentration was measured by the Bradford method (Bradford, 1976) using Bio-Rad Reagent, with bovine serum albumin as a standard.

Radioligand Binding to Membrane Suspensions: Membrane suspensions \were diluted in binding buffer supplemented with 0.1% bovine serum albumin and 0.1% bacitracin to yield an optimal membrane protein concentration: 0.02 mg/ml for human Y1 receptors, 0.015 mg/ml for mg 0.01S mg/ml for WO9517906 PCTUS94/14436 'WO 95/17906 receptors, and 0.25 mg/ml for SK-N-Be(2). (Under these conditions, 2 5 1I-PYY bound by membranes in the assay was less than 10% of 25 I-PYY delivered to the sample.) 1"I-PYY and non-labeled peptide competitors were also diluted to desired concentrations in supplemented binding buffer.

Individual samples were then prepared in 96-well polypropylene microtiter plates by mixing membrane suspensions (200 ul), 12I-PYY (25 ul), and non-labeled peptides or supplemented binding buffer (25 ul).

Samples were incubated in a 30 oC water bath with constant shaking for 120 min. Incubations were terminated by filtration over Whatman GF/C filters (pre-coated with polyethyleneimine and air-dried before use) Filtertrapped membranes were counted for 1 251 in a gamma counter.

Non-specific binding was defined by 100 nM human PP for receptors and by 100 nM NPY for Y1 and SK-N-Be(2) receptors. Specific binding in time course and competition studies was typically 80%; most non-specific binding was associated with the filter. Binding data were analyzed using nonlinear regression and statistical techniques available in the GraphPAD InPlot package (San D i e g o C A Porcine 'I-PYY was from New England Nuclear (Boston, MA).

NPY and related peptide analogs were from either Bachem California (Torrance, CA) or Peninsula (Belmont, CA).

Whatman GF/C filters were from Brandel (Gaithersburg, MD). Bio-Rad Reagent was from Bio-Rad (Hercules, CA).

Bovine serum albumin and bacitracin weie from Sigma (St.

Louis. MO). All other materials were reagent grade.

Functional Assay: Radioimmunoassay of cAMP Stably transfected cells were seeded into 96-well microtiter plates and cultured until confluent. To reduce the potential for receptor desensitization, the serum component of the media was reduced to 1.5% for 4 to 16 hours before the assay. Cells were washed in Hank's buffered saline, or HBS (150 mM NaC1, 20 mM HEPES, 1 mM SCaClj, 5 mM KC1, 1 mM MgC1 and 10 mM glucose) CI JI WO 95/17906 PCT/US94/14436 -51supplemented with 0.1% bovine serum albumin plus 5 mM theophylline and pre-equilibrated in the same solution for 20 min at 37 OC in 5% CO,. Cells were then incubated min with 10 /M forskolin and various concentrations of receptor-selective ligands. The assay was terminated by the removal of HBS and acidification of the cells with 100 mM HC1. Intracellular cAMP was extracted and quantified with a modified version of a magnetic beadbased radioimmunoassay (Advanced Magnetics, Cambridge, MA). The final antigen/antibody complex was separated from free 1 25 1-cAMP by vacuum filtration through a PVDF filter in a microtiter plate (Millipore, Bedford, MA), Filters were punched and counted for 125 I in a Packard gamma counter. Binding data were analyzed using nonlinear regression and statistical techniques available in the GraphPAD Prism package (San Diego, CA).

Functional Assay: Intracellular Calcium Mobilization The intracellular free calcium concentration was measured by microspectroflourometry using the fluorescent indicator dye Fura-2/AM, Stably transfected cells were seeded onto a 35 mm culture dish containing a glass coverslip insert. Cells were washed with HBS and then loaded with 100 Al of Fura-2/AM (10 AM) for 20 to 40 min.

After washing with HBS to remove the Fura-2/AM solution, cells were equilibrated in HBS for 10 to 20 min. Cells were then visualized under the 40X objective of a Leitz Fluovert FS microscope and fluorescence emission was determined at 510 nM with excitation wave lengths alternating between 340 and 380 nM. Raw fluorescence data were converted to calcium concentrations using standard calcium concentration curves and software analysis techniques.

Tissue Localization and Gene Expression: Reverse Transcriptase PCR Human tissues (obtained from National Disease Research I-h-CI BC id WO9517906 PCTUS94/14 436 *WO 95/17906 -52- Interchange) were homogenized and total RNA extracted using guanidine isothiocyanate/CsCl cushion method (Kingston, 1987). RNA was treated with DNase to remove any contaminating genomic DNA. cDNA was prepared from total RNA with random hexanucleotide primers using reverse transcriptase (Superscript II; BRL). An aliquot of the first strand cDNA (250ng of total RNA) was amplified in a 50 Al PCR reaction mixture (200gM dNTPs final concentration) containing 1.2U of Taq polymerase in the buffer supplied by the manufacturer (Perkin-Elmer Corporation), and 1 AM of primers, using a program consisting of 30 cycles of 940C./2', 680C./2', and 720C./3', with a pre- and post-incubation of 950C./5' and 720C./10', respectively. PCR primers for human Y4 were designed against the human Y4 sequence in the third intracellular loop and carboxy terminal regions: CGCGTGTTTCACAAGGGCACCTA-3' and respectively.

The PCR products were run on a 1.5% agarose gel and transferred to charged nylon membranes (Zetaprobe GT, BioRad), and analyzed as Southern blots. Hybridization probes corresponding to the receptor region flanked by PCR primers were prepared (5 TCCGTATGTACTGTGGACAGGGGCAGATGCTCCGACTCCTCCAGG-3') and pre-screened for the absence of cross-reactivity with hu~an Y1 and human Y2 receptor subtypes. Filters were hybridized with end-labeled [y-"P]ATP internal probe to the PCR p'imers, washed under high stringency, and exposed to Kodak XAR film in the presence of an intensifying screjn, as described above. Similar PCR and Southern blot analysis were conducted with primers and probe directed to the housekeeping gene, glyceraldehyde-3-phosphate dehydrogenase (Clontech, Palo Alto, CA), and demonstrated that equal amounts of cDNA from the different tissues were being assayed for NPY expression, -i WO 95/17906 Y~ TS '94/14436 -53- Results A human genomic placenta library was screened, under reduced stringency conditions, with oligonucleotide probes directed to the first, second, third, fifth, and seventh transmembrane regions of the rat Y1 neuropeptide receptor gene (Eva, C. et al., 1990; GenBank accession No. Z11504) Positively-hybridizing clones (-100-150) were isolated, plaque-purified and characterized by Southern blot analysis and sequencing. One clone, contained a 1.3 kb PstI fragment which hybridized with the rat Yl-derived oligonucleotide probes and was subsequently subcloned into a pUC vector. DNA sequence analysis indicated greatest homology to the rat and human Y1 receptor genes. This clone was a partial intronless gene fragment, encoding part of the third intracellular loop through the carboxyl terminus, including a termination codon.

In order to obtain a full-length clone, a 2.0 kb BamHI/EcoRI hybridizing fragment, containing the entire coding region, which was intronless, was subcloned into an expression vector and sequenced. The genomic fulllength construct in the expression vector (called contains an open reading frame of 1127 bp, with 680 bp of the predicted 5' UT and 205 bp of predicted 3' UT sequence, and encodes a protein of 375 aa in length, with a relative molecular mass of -41,000 daltons. Hydropathy analysis of the protein is consistent with a putative topography of seven transmembrane domains, indicative of the G proteincoupled receptor family.

Initial sequence analysis revealed that clone contained several conserved structural features/residues found among the members of the neuropeptide receptor -I iY L ~M WO 95/17906 PCTIUS94/14436 -54family, including two glycines and asparagine in TM1 (positions 55, 58 and 59, respectively, in Fig. an asparagine, leucine and aspartic acid in TM2 (positions 82, 83, and 87, respectively, in Fig. a serine and leucine in TM3 (positions 128 and 132, respectively, in Fig. a tryptophan and proline in TM4 (positions 164 and 173, respectively, in Fig. a tyrosine and proline in TM5 (positions 223 and 226, respectively, in Fig. 2), a phenylalanine, tryptophan, and proline in TM6 (positions 275, 279, and 281, respectively, in Fig. 2), and a serine, threonine, asparagine, and proline in TM7 (positions 315, 316, 319, and 320, respectively, in Fig.

Other features of this human hp25a receptor gene are the presence of three potential sites for N-linked glycosylation in the amino terminus (asparagine residues 2, 19, and 29; Fig. 1) and the presence of several serines and threonines in the carboxyl terminus and intracellular loops, which may serve as sites for potential phosphorylation by protein kinases.

A comparison of nucleotide and peptide sequences of clone with sequences contained in the Genbank/EMBL databases reveals that the clone is most related to the rat, mouse and human Y1 receptor genes and proteins (see Fig. The hp25a clone exhibits 42% overall amino acid identity with the human NPY-1 receptor and 55% identity when comparing only the transmembrane domains between and Y1. The comparison of the individual amino adid residues in the TM domains between hp25a and Y1 reveal 57%, 57%, 57%, 52%, 63%, and 71% identity in Sthe corresponding one through seven TM regions, repectively. The hp25a clone hybridized only with the TM7-specific probe from the original set of rat-derived TM probes originally used to screen the library which is consistent with the hp25a clone sharing the highest degree of amino acid identity with the TM7 domain of the rat Y1 receptor.

MrV'rrI r %I rrc+ rw t It f! 1 S'WO 95/17906 PCT/US94/14436 A rat homolog of the human Y4 receptor, designated rsl6b, was isolated from a rat spleen genomic library using probes derived from the transmembrane regions of the human Y4 receptor. The nucleotide sequence of rsl6b is identical in the coding region to the nucleotide sequence of the human Y4 receptor, and encodes a protein 375 amino acids in length (Figure The rsl6b clone exhibits 75% overall amino acid identity with the human Y4 amino acid sequence, and in the putative transmembrane domains (TMs), the protein predicted by rsl6b exhibits 84% amino acid identity with the human Y4 receptor. This degree of primary amino acid sequence identity is lower than is typically seen for species homologues, and suggests that rat and human Y4 receptors may exhibit functional variations as well. The predicted intracellular loop between TMs V and VI is particularly divergent, showing only 56% amino acid identity between rat and human Y4; divergence in this region could potentially mediate differences in G-protein coupling between the rat and human receptors. The primary sequences of rat and human Y4 receptors also show differences in their patterns of sequence motifs for casein kinase II phosphorylation, N-myristoylation, and protein kinase C phosphorylation; these sites could potentially mediate differences in the function or regulation of the two receptors.

Monkey kidney cells transiently expressing the gene encoding the hp25a receptor were used for pharmacological evaluation. Membranes harvested from transiently transfected Cos-7 cells exhibited high affinity, saturable [1("IPYY binding. The time course of specific binding was measurd in the presence of 0.06 nM 125I-PYY (Fig. The association curve was monophasic, with a an observed association rate (Kob) of 0.12 0.02 min' and a t 1 2 of 6 min; equilibrium binding was 95% complete A .f WO 95/17906 PCT/US94/14436 -56within 26 min and 100% complete within 50 min (n 3).

For comparison, we also measured the time course of binding to human Y1 receptors transiently expressed in COS-7 cells. The association curve was monophasic, with a Kobs of 0.06 0.02 min' 1 and a t 1 /2 of 12 min; equilibrium binding was 95% complete within 51 min and 100% complete within 90 min (n 3) (data not shown). The different patterns of radioligand association for hp25a and human Y1 receptors suggest novel mechanisms of receptor/ligand interaction.

Saturation binding data for 1 "I-PYY were fit to a one-site model with an apparent Kd of 0.11 0.01 nM and an apparent of 1.42 0.05 pmol/mg membrane protein, corresponding to approximately 1.4 x 10 s receptors/cell (n 4; Fig. Given that the transfection efficiency was 20-30% (data not shown), the receptor density on transfected cells was probably closer to x 10 5 /cell.

Membranes from mock-transfected cells, when prepared and analyzed in the same way as those from cells, displayed no specific binding of 12sI-PYY. We conclude that the 1I-PYY binding sites observed under the described conditions were derived from the construct.

The pharmacological profile of hp25a was defined by membrane binding assays. The receptor was probed for features of all well characterized pancreatic polypeptide family receptors including Y1, Y2, Y3, and PP. The rank order of affinity for several peptide analogs was derived from competitive displacement of 12 sI-PYY (Fig. 7 and Table 2) The hp25a receptor was compared with two model systems: 1) the cloned human Y1 receptor (Larhammar et al., 1992; Herzog et al., 1992) transiently expressed in COS-7 cells, and 2) the Y2-like receptor population expressed by human SK-N-Be(2) neuroblastoma cells (Wahlestedt et al., 1991; Dumont et al., 1992). No *WO 95/17906 PCTIUS94/14436 -57models for human Y3 and human PP receptors have been described.

PP bound to hp25a with extremely high affinity 0.029 nM) and dramatic selectivity: PP was 6000-fold selective for hp25a over human Y1 receptors (K1 200 nM) and SK-N-Be(2) receptors (Ki 300 nM). This profile suggests that hp25a could function selectively as a PP receptor in vivo. The data further indicated, however, that hp25a bound quite well to human NPY (K i 1.4 nM) and even better to human PYY (Ki 0.62 nM). These K i values, while lower than the K i for PP, are comparable to the effective concentrations of NPY and PYY from numerous physiological and pharmacological studies (Dumont, 1992).

In our investigation, SK-N-Be(2) receptors bound human NPY and human PYY in the same rank order as hp25a but with 5- to 10-fold higher affinity, whereas human Y1 receptors bound human NPY and human PYY in the opposite rank order with 5- to 30-fold higher affinity. Hydrolysis of the carboxy terminal amide to free carboxylic acid, as in human NPY free acid, was disruptive for binding to all receptors. A requirement for a carboxy terminal amide appears to be a common structural feature of all pancreatic polypeptide family peptide/receptor interactions.

Fuhlendorff and co-workers replaced Ile and Gln 34 in NPY with the corresponding residues from PP to create [Leu 31 ,Pro 34 ]NPY, which is commonly used to distinguish Y1 from Y2 receptors (Fuhlendorff, 1990). Human [Leu 31 ,Pro 34 ]NPY displayed 2300-fold selectivity for human Y1 receptors over SK-N-Be(2), but only selectivity for human Y1 receptors over hp25a. Human [Leu 31 ,Pro 3 4]NPY was a better ligand for hp25a 0.60 nM) than was human NPY itself (K i 1.4 nM) This is possibly a reflection of the way in which tLeu,Pro 3 4 NPY mimics PP at positions 31 and 34. In contrast, the WO 95/17906 PCTUS94/14436 -58- [Leu 3 n,Pro 34 ]NPY analog was well tolerated by the human Y1 receptor (K i 0.13 nM), but not preferred over the parent peptide 0.049 nM) hp25a displayed an intermediate level of sensitivity to N-terminal deletions of NPY and PYY, less so than human Y1 receptors. Removing Tyr 1 from porcine NPY resulted in a 29-fold loss in affinity for human Y1 receptors when compared with the full length parent peptide. The same modification decreased affinity 4-fold for receptors and 3-fold for SK-N-Be(2) receptors. It is interesting in this regard that human PP contains Ala 1 the Tyr' of NPY may not play much of a role in receptor recognition. Truncation to NPY, 3 decreased affinity 1000-fold for human Y1 receptors, 33-fold for hp25a, and 4-fold for SK-N-Be(2) receptors. Further truncation to porcine NPY 2236 decreased affinity 3500-fold for human Y1 receptors, 120-fold for hp25a, and 11-fold for SK-N- Be(2) receptors. In this regard, the hp25a receptor shares features of both Yl- and Y2-like pharmacology, as would be expected if the N-terminal region of porcine NPY were only moderately involved in receptor recognition.

An important structural difference between human PP, human PYY and human NPY is that both human NPY and PYY contain Gln 34 whereas human PP contains Pro" 4 When Gln 3 4 in NPY was replaced with Pro 34 (as in the analog [Leu 3 n, Pro 34 NPY), an increase in binding affinity for the human Y4 receptor was observed. A similar increase in binding affinity was detected when Gln 34 of PYY was replaced with Pro 34 supporting the proposal that PP-like peptides are preferred by the Y4 receptor. Replacement of Pro 3 4 in human PP by Gln 3 (as in [Ile Gln 34

]PP)

caused very little change in PP binding affinity, however, suggesting that in the case of PP there are significant contributions to binding affinity from other regions of the peptide structure.

r" Ol'flt tr e -r -WO 95/17906 PCTNUS94/14436 -59- Applicants further extended the structure/activity data for human PP fragments (PP 2 3

PP

1 -a 6

PP

2 0 3 6

PP

2 -a 6 and PPi-36). PP binding was unaffected by N-terminal truncation to PP2- 3 6 but further truncation to PP,.

3 and beyond was disruptive. The shortest PP fragment tested,

PP

3 3 6 bound selectively to the Y4 receptor with Ki 350 nM, and hydrolysis of the C-terminal amide was detrimental (Ki 10,000 nM for human PP 3 1- 36 free acid), as reported earlier for NPY. We conclude that the binding of PP to the Y4 receptor resembles the binding of NPY to the Y1 receptor, in that 1) Pro 34 is well-tolerated and 2) both ends of the peptide are required for optimal binding activity. This is in contrast to the Y2 binding model, in which 1) Pro 34 is not well-tolerated and 2) the N-terminal region of NPY does not contribute significantly to binding affinity. Note also that the Y2-selective ligands human PYY 3 .a 3 and C2-NPY display relatively low affinity for the human Y4 receptor.

Additionally, the binding of the tetrapeptide invertebrate neurotransmitter Phe-Met-Arg-Phe-Amide (FMRF-amide) was investigated. This peptide has been shown to mimic several functions of NPY including the stimulation of food intake in rats (Robert, 1988).

FMRFamide bound selectively to the Y4 receptor with a Kj value of 4000 nM. A closely related derivative, Phe-Leu- Arg-Phe-amide (FLRFamide), displayed improved Y4 binding affinity (K i 750 nM) while maintaining selectivity. We also investigated the binding of [D-Trp 3 2NPY, This peptide was reported to stimulate food intake when injected into rat hypothalamus, and also to attenuate NPY-induced feeding in the same paradigm (Balasubramaniam, 1994). [D-Trp]"NPY displayed relatively low binding affinity for the human Y4 receptor as well as for the human Y1 and Y2 receptor subtypes, Data for these and other new peptides not included in the original patent filing are listed in Table 3.

WO 95/17906 PCTIUS94/14436 Untransfected NIH-3T3 and LM(tk.) were pre-screened for specific 25 I-PYY binding and found to be negative (data not shown). After co-transfection with the human Y4 cDNA and a G418-resistant gene and selection with G-418, surviving colonies were screened for specific binding of 125 I-PYY. Two positive clones were identified and isolated for further study (NIH-3T3 hY4 clone #5 and LM(tk-) hY4 clone The binding of 125I-PYY to membranes from the NIH-3T3 stable clone was saturable over a radioligand concentration range of 0.5 pM to 2.5 nM. Binding data were fit to a one-site binding model with an apparent Ka of 0.17 nM 0.005 and a receptor density of 350 fmol/mg membrane protein (mean n The LM(tk-) clone displayed an estimated receptor density of 7 fmol/mg membrane protein during the primary selection screen and was not analyzed further in a saturation assay.

Activation of all Y-type receptors described thus far is thought to involve coupling to pertussis toxin-sensitive G-proteins which are inhibitory for adenylate cyclase activity (Gior Go) (Wahlestedt and Reis, 1993). Based on these prior observations, we investigated the ability of PP to inhibit forskolin-stimulated cAMP accumulation in LM(tk-) cells stably expressing the human Y4 receptor.

Incubation of intact cells with 10 AM forskolin produced increase in cAMP accumulation over a 5 minute period, as determined by radioimmunoassay. Simultaneous incubation with human PP decreased the forskolinstimulated cAMP accumulation by 67% in stably transfected LM(tk-) cells (Fig. 8) but not in untransfected cells (data not shown). Applicants conclude that human Y4 receptor activation can result in decreased cAMP accumulation, very likely through inhibition of adenylate cyclase activity.

Peptides selected for their ability to bind to the WO 95/17906 PCTIUS94/14436 -61transiently expressed human Y4 receptor were investigated for their ability to activate the human Y4 in the cAMP assay (Table Note that both human PP and human PP,.

36 bound the Y4 receptor with a K, value of 0.06 nM, and that each displayed comparable activity in the cAMP assay with closely matching EC 0 s values of 0.09 nM and 0.08 nM, respectively. The truncated PP fragments PP 2 7- 36 and PP3.- 6 were relatively weak ligands in the binding assay and were also less than 50% as effective as the full length PP in reducing forskolin-stimulated cAMP, thereby acting as partial agonists. Similarly, both NPY and PYY (which deviate from PP primarily in the N-terminal regions) yielded ECso values 10-fold larger than their Ki values. Receptor activation (more so than binding) may therefore depend heavily upon N-terminal PP structure.

The functional activity of the reported feeding behavior modulator [D-Trp 3 ]NPY was also investigated. Consistent with this peptide's low binding affinity for the human Y4 receptor, no functional activity of the peptide was detected at concentrations up to 0.3 uM (see Table or when tested at 0.3 uM for antagonism of the PP functional response (data not shown).

The intracellular free calcium concentration was markedly increased in LM(tk-) cells stably transfected with the human Y4 receptor after application of 100 nM human PP (A [Ca 2 I] 325 nM; Fig. The response to 100 nM NPY was relatively small (A (Ca 2 68 nM) Untransfected LM(tk-) cells were unresponsive to either peptide (data not shown). When human PP was further analyzed in a concentration/response curve, the maximum A [Ca 2 1) measured was 334 nM and the EC, 0 was 35 nM (Fig. 9, Inset). This greater activity of PP over NPY is consistent with the pharmacological profiles derived from both binding and cAMP assays described above. The calcium mobilization assay thereby provides a second pathway through which Y4 receptor activation can be h ~C CCIY IYC ~k UIIL CI U of human tissues. Relatively intense hybridization -62- i signals were detected in total brain, coronary artery, and ileum, suggesting a potential role for Y4 receptors in CNS function, cardiovascular regulation, and gastrointestinal physiology (Table The cDNA corresponding to the rat Y4 homolog was transiently expressed in COS-7 cells for membrane binding studies. The binding of 1 5 I-PYY to the rat Y4 receptor was saturable over a radioligand concentration of 0.5 pM to nM. Binding data were fit to a one-site model with an apparent Kd of 0.15 nM 0.005 and a receptor density of 275 3 fmol/mg membrane protein (mean n As determined by using peptide analogs within the pancreatic polypeptide family, the rat Y4 pharmacological profile bears a resemblance to the human Y4 receptor; there are several interesting exceptions, however, including frog PP, salmon PP, human PP3.36, and avian PP, each of which discriminated -10-fold between the rat and human receptor subtypes (Table The differences may reflect the fact that PP is not well conserved among species relative to NPY and PYY; hence the species homologs of PP are likely to exhibit more variability in ligand binding.

In summary, both the human Y4 receptor and the rat Y4 receptor displayed features unique among the neuropeptide receptors, exhibiting a profile which is divergent from their closest relatives, Y1 or Y2, in that each binds optimally to PP rather than to NPY or PYY (see Tables 1, 2 and Unlike the Y1 and Y2 receptor models, the Y4 receptor appears to be a reasonable target for all three peptide ligands.

BI

TABLE I Pharmacologically defined receptors for NPY and related pancreatic polypeptides.

Rank orders of affinity are based on published reports of binding and functional data (Wahlestedt et al., 1991; Schwartz et al., 1990; Wahlestedt et al., 1993; Dumont et al., 1992). Missing peptides in the series reflect a lack of published information.

Receptor Affinity (-pK i or -pECs 0 11 to 10 10 to 9 9 to 8 8 to 7 7 to 6 6 Y1 NPY NPY2.3, NPY,3.3, PP

PYY

PY

Y2 PYY NPY-36 [Leu 1 Pro 34

N

PY

NPY pp NPY,2-3 Y3 NPY [Pro 3 4 NPY NPY 13 36

PYY

PP

PP PP [Leu 31 Pro 34 N

NPY

PY

ArP I 1' -9 'C 11 -113 -1 i j r f TABLE 2 Pharmacological profile of the hp25a receptor.

Binding data reflect competitive displacement of "'I-PYY from membranes of COS-7 cells transiently expressing hp25a receptors. Peptides were tested at concentrations ranging from 0.001 nM to 100 nM.

ICso values corresponding to 50% displacement were determined by nonlinear regression analysis and converted to K, values according to the equation, K i ICs/(1 [LI/Kd), where is the 2 5

I-PYY

concentration and Kd is the equilibrium dissociation constant of 125 I-PYY. The data shown are representative of at least two independent experiments.

Competitor Human Y1, hp25a, SK-N-Be(2), K, (nM) Ki (nM) K i (nM) human PP 200 68 0O029 0.006 300 human 0.13 0.02 0.60 0.09 300 [Leul'Pr34 NPY human PPY 0.085 0.021 0.62 0.15 0.11 0.02 porcine NPY 0.049 0.001 1.2 0.2 0.28 0.04 human NPY 0.049 0.009 1.4 0.1 0.13 0.02 porcine NPY 2 36 1.4 0.2 4.4 1.3 0.41 0.09 porcine HPY 3 36 51 16 39 5 1.8 0.4 porcine PYY,3.3 6 32 7 47 6 0.86 0.14 porcine NPY,.

3 45 4 54 2 5.0 porcine NPY8.3as 28 5 63 7 2.1 human NPY free acid 300 79 17 280 120 porcine NPY 2 0 3 62 6 100 20 3.1 0.6 porcine NPY 22 .3s 170 30 140 63 3.2 0.6 porcine NPY 26 3 6 300 300 70 7

A

o- SWO 95/17906 PCT/US94/14436 Table 3: human Y4 receptor vs. Y-type receptors cloned from human.

Binding data reflect competitive displacement of "I-PYY from membranes of COS-7 cells transiently expressing human Y1, human Y2, and human Y4 receptors. IC,, values corresponding to 50% displacement were determined by nonlinear regression analysis and converted to K, values according to the equation Chang-Prusoff equation, K,

IC

50 where is the 1 5 I-PYY concentration and Kd is the equilibrium dissociation constant of 1251_ PYY. Any peptide not included in the original patent filing is referred to as a "new peptide".

.4 0 -WO 95117906 PCVULS94/14436 -66- Table 3 Peptide Y1 Y2 Y4 Comments PP, human 77 1> 0.06 1000

PP

2 human >40 100 0.06 new peptide PP1 3 human 100 I> 100 I39 new jpeptide

PP

2 0 -361 human 100 100 100 new peptide Pp 7 36 hvman I> 100 100 88 new peptide PP31, 3 6 17uman 10000 350 ne 10000 peptide

PP

3 1- 36 f ree 10000 new acid, human f10000 I10000 peptide Phe-Met-Arg- 12000 1 75000 4000 Phe -Amide Phe-Leu-Arg- 15000 750 new Phe-Amide 10000 peptide 0 (Ile", 86 20 0.09 new Gln 43 PP, peptide human ipP, bovine 240 820 0.05 new peptide ~PP, rat 460 0.18 new 1000 peptide

V

W%~vrt rre- ri it-r-P jew ij rf, 2K 'WO 95/1790 6 PCT1US94/14436 -67- Table 3 continued Peptide Y1 Y2 IY4 Comments, PP, salmon 0.20 0.17 3.2 new peptide PP, avian 400 7.0 new 1000 peptide PP, frog 98 >61 new 1000 peptide 1 PYY, human 0.19 0.36 0.87 PYY, porcine 0.14 0.35 1.3 new peptide

PYY

3 3, human 45 0.70 14 new I peptide PY1331 3 1.5 46 porcine (prO 34 pyy, 0.14 3101 0.12 new humanpeptide Peptide I Y2 Y4 iNotes NPY, human 0,08 0.74 2.2 NPY, porcine 0.07 0.81 1.1 iMelanostatin 0.07 0.87 1 1.2 1 new (frog NPY) peptide

NP

2 1 6 t human 3.6 2.0 16 new peptide

NPY-

6 0 2.4 1.2 5.6 porci.ne

NPY

13 36 70 2.5 38 porcine SUBSTITUTE SHEET (RULE 26) 2/ 1 1, WPA--w I M, -4 PCTJUS94/14436 ,WO 95/17906 -68- Table 3 Continued Peptide Y1 Y2 Y4 'Comments

NPY

16 36 1 421 3.6 54 porcine

NPY

18 36 70 4.2 290 porcine

NPY

2 0 3 6 1 63 3.6 120 porcine

NPY

2 2 3 6 1 1000 18 990 porcine

NPY

26 3 6 1 1000 380 304 porcine [LeU 31 0.15 2.20 1.1 Pr031 INPY, ihuman 0.15 540 1.5 new Pro 34 )NPY, peptide porcine O-Me-Tyr 21 0.12 11.55 6.1 new NPY, human ipeptide NPY free 490 1000 acid, human 1000 jNPYI.

24 amide, 1000 1000 new human 1000 peptide C2-NPY, 73 3.5 120 new porcine peptide LD-Trp 2 NPY, 1000 1000 new human 1000 peptide 'WO 95/17906 PCTUS94/14436 -69- TABLE 4: Functional activation of the human Y4 receptor and inhibition of cAMP accumulation.

Ki values were derived from binding assays as described in, Table 3. Peptides were evaluated for binding affinity and then analyzed for functional activity. Functional data were derived from radioimmunoassay of cAMP accumulation in stably transfected LM(tk-) cells stimulated with 10 pM forskolin. The maximum inhibition of cAMP accumulation relative to that produced by human PP (Emax) and the concentration producing a half-maximal effect (ECs 0 were determined by nonlinear regression.

*t( 'WO 95/17906 PTU9/43 PCTIUS94114436 Table 4 Peptide Binding Function Ki (nM) EC 50 (nM) max PP, human 0.06 0.09 100%

PP

236 human 1 0.06 0.08 101%

PP

13 36 human 39 580 96% PP2 7 36 human 88 3500 50

PP

3 36 human 10000 89000 47 le [1e,G n 3 JP 09 0.27 101% I human salmon PP 3.2 110 96% PYY, humian 0.87 47 118% [Pro 34 PY 0.12 1.1 106% human NPY, human 2.2 20 98% NPY, porcine 1.1 68 105%

NPYIS-

36 290 Not detected [Leu 3 ,Pro"]N i 1.1 35 105% PY, human (Leu 3 1 ,Pr& 4 ]N 1 1.5 26 111% PY,porcine f-w Wewri-ri p- bi rp.% ,WO 95/17906 PCTIUS94/14436 Table 4 COntinued IPeptide

IB

-71indingI Function 1000 ]Not detected Trp 32

]NPY,

human WO 95/17906 PCTUS94/14436 -72- TABLE 5: Macrolocalization of Y4 receptor mRNA in human tissues by PCR.

Localization data reflect PCR-based amplification of human Y4 cDNA derived from mRNA extracts of human tissues. Southern blots of the PCR products were prepared Sand hybridized with 3 P-labeled oligonucleotide probes selective for Y-type receptor subtypes. The labeled products were recorded on X-ray film and the relative signal density was determined by visual inspection. In this rating scheme, faint signal, moderate signal, intense signal.

ii WO 95/17906 PCT/US94/14436 -73- Table Human tissues human Y4 PCR product total brain frontal brain ventricle (heart) atrium (heart) thoracic aorta coronary artery nasal mucosa mesentery stomach ileum pancreas not determined liver kidney not determined bladder penis testes uterus (endometrium) uterus (myometrium) J a WO 95/17906 PCTIUS94/14436 -74- TABLE 6: Pharmacological binding profile of the rat Y4 receptor vs. the human Y4 receptor.

Binding data reflect competitive displacement of 2- PYY from membranes of COS-7 cells transiently expressing rat Y4 and human Y4 receptors. ICs, values corresponding to 50% displacement were determined by nonlinear regression analysis and converted to K. values according to the equation Chang-Prusoff equation, K, ICs 5 where is the 12I-PYY concentration and Kd is the equilibrium dissociation constant of '2 5

I-

PYY.

ei mO'rn rrr CurU1 r ir Hf t% W0 951790PCT1US94/14436 VO 95/17906 Table 6 1Peptide Rat Y4 Human Y4 PP, human 0.12 0.06 PP, rat 0.20 0.18 *PP, bovine 0.15 0.05 PP, frog 0.19 62 IPP, salmon 0.36 3.2

IPP

31 36 human 20 350 ,PP, avian 82 7

PP

31 36 free acid, human 100 10000 PYY, porcine 0.58 1.3 NPY, human 1.7 2.2 NPY, porcine 1.8 1.1

NPY

2 36 human 516

NPY

13 36 porcine 135 .38 [Leu 31 ,ProII1NlPY, 0.591.

*human NPY free acid, human 1000 1000 C 2-NPY, porcine 22 120 [D-Trp32]NPY, human 1000 1000 SITmTE SHEET (RULE 26) ,WO 95/17906 PCT/US94/14436 ii -76- Discussion Applicants have cloned DNA representing a novel human neuropeptide Y/peptide YY/pancreatic polypeptide receptor (Y4) from human genomic DNA. Of all known G protein-coupled receptor sequences (EMBL/Genbank Data Base), the greatest homology was displayed between and the Y1 receptor genes (mouse--Eva et al., 1992; rat--Eva et al., 1990; and human--Larhammar et al., 1992). Comparison of the human hp25a deduced amino acid sequence with known G protein-coupled receptor sequences indicates the greatest concentration of identical amino acids to be in the transmembrane domains. In these TM regions, the percentage of identity for hp25a clone is 55% compared to human Y1, and less than 35% with other members of the peptide subfamily and other G protein-coupled receptor subfamilies. The alignment of this human sequence, relative to other G protein-coupled receptors or other members of the neuropeptide receptor subfamily, specifically human Yl, indicates a unique sequence, proviing hp25a is a newly characterized receptor. The homology of hp25a to Yl indicates that it is related to the NPY/PYY/PP family of receptors.

While the hp25a human receptor sequence exhibits higher overall and transmembrane identity to the rsl6b rat Y4 receptor sequence than to other Y-type receptors such as the human Y1 receptor, the divergence between the rat Y4 and human Y4 sequences may contribute to the 30 pharmacological differences between the two receptors.

The isolation of the rat homologue of the Y4 receptor provides the means to compare the pharmacological properties of the rat and human Y4 receptors (see below) in relation to their observed differences in primary structures. These data will be critical to the design and testing of human therapeutic agents acting 1. r c i ~g -h l~ ~LI sly~ IC~1 ~d C 'WO 95/17906 PCTJS94/14436 -77at these sites.

The unique pharmacological profile of the hp25a human Y4 receptor suggests that this receptor can serve as a I 5 novel target for the development of subtype selective ligands. The competitive displacement studies indicate that human PP is the preferred ligand for hp25a. The receptor also binds with high affinity to human NPY and human PYY, which share Z 47% amino acid identity with human PP. Affinity is enhanced by modifying NPY to closely resemble PP, as in [Leu 3 n,Pro"] NPY. Decreased affinity for C-terminal fragments of NPY suggest that both N- and C-terminal regions of NPY contribute to receptor recognition. hp25a was less sensitive to N-terminal deletion of NPY than was the human Yl receptor. One may speculate that both Y1 and share a common mechanism of peptide interaction which has been optimized for either NPY or PP, respectively.

The pharmacological data do not support classification of hp25a as a Y1 receptor, in which case it would display 4000-fold selectivity for binding to human NPY over human PP (Table Neither do the data support classification as a Y2 receptor, in which case it would tolerate N-terminal deletion of NPY but not exchange of Gln 34 for Pro" (Table Finally, the data fails to support the classification of hp25a as a Y3 receptor, since it would be expected to display greater affinity for NPY than for PP or PYY (Wahlestedt et al., S 30 1991). Therefore, applicants are designating the receptor as a Y4 receptor.

The additional data included here reflect an increased understanding of receptor ligand/interactions. Our further characterization of Y4 receptor pharmacology has indicated, for example, that the binding affinity r 'WO 95/17906 PCT/US94/14436 -78for either human NPY 2.2 nM) or human PYY 0.87 nM) can be enhanced by conversion to human [Leg, Pro 3 4 ]NPY (Ki 1.1. nM) or human [Pro 34 ]PYY 0.14 nM). This information supports the importance of Pro34- in the peptide pharmacophore and could potentially be incorporated into the design of metabolically stable nonpeptide ligands with Y4selectivity. Additionally, the data prompt a reevaluation of literature reports in which [Pro 34 ]PYY is described as a Y1-selective ligand. Our results indicate that [Pro 4 ]PYY does not discriminate between the cloned human Y1 and cloned human Y4 receptor 0.12 and 0.14 nM, respectively) such that [Pro 34

]PYY

cannot be used in isolation to define receptor subtypes.

Other particularly interesting peptides include FMRFamide, FLRF-amide, and [D-Trp 32 NPY. FMRF-amide and [D- Trp" 3 NPY have both been shown to modulate food intake in rats (get ref from George M While FMRF-amide and its derivative displayed some degree of Y4-selectivity (albeit relatively low affinity compared to human PP), [D-Trp" 2 NPY was essentially inactive at all Yreceptor subtypes studied. These profiles must be considered as efforts are undertaken to validate the receptor mechanism of NPY-induced food intake. The tetrapeptide FLRF-amide has additional value as a starting point for the design of small nonpeptide 0 compounds with Y4 selectivity.

Applicants now have several Y4 receptor expression systems from which to chose, each uniquely suited to different research questions. The transient expression system in COS-7, for example, allows one to generate sufficient quantities of membranes for routine struct're/activity relationship questions. Applicants can also produce mutant receptors by site-directed SWO095/17906 PCTIUS94/14436 -79mutagenesis or other mutagenesis techniques and express them transiently in COS-7 for a comparison of pharmacological properties with those of the wild-type receptor. In this way, one can gain insight into receptor binding pockets, ligand binding domains, and mechanisms of activation. Whereas the transient expression system requires a new transfection for every cell or membrane harvest, the stable expression system offers the convenience of a single transfection step followed by routine passaging techniques. The stable system also offers the opportunity to select receptor density, which could be an important factor in evaluating the intrinsic activity of Y4 receptor ligands.

1 Applicants' characterization of the stably expressed Y4 receptor now shows definitively that the Y4 receptor can couple simultaneously to both cAMP regulation and calcium mobilization in a single cell type. The EC 0 for the calcium response is significantly higher than the EC, 0 for the cAMP response, suggesting that calcium mobilization may reflect promiscuous coupling of the receptor to G-protein other than that required for cyclase regulation. The functional assays allow one to assign agonist and antagonist activities to receptor selective compounds and thereby provide one with critical tools for drug design.

The question logically arises as to whether should be classified as PP receptor. To applicants' knowledge, no human PP receptor has been described.

One must therefore look to the rat PP receptor for comparison. The rat PP receptor bound PP and analogs in the same rank order as hp25a (PP [Leu 31 ,Pro 4 ]NPY 35 NPY) (Schwartz et al., 1990). The rat PP receptor also appeared to bind both N- and C-terminal regions of the peptide ligand (Schwartz et al., 1987) A glaring SUBSTITUTE SHFFT (RULE 26 i i A I 1 'WO 95/17906 PCT/US94/14436 discrepancy between hp25a and the rat PP receptor is that the latter displayed 10,000-fold selectivity for PP over NPY (Schwartz et al., 1990).

In applicants' localization experiments Y4 mRNA was detected by PCR techniques in a broad 'ange of human tissues. Relatively intense hybridization signals were detected in total brain, coronary artery, and ileum, suggesting a potential role for Y4 receptors in CNS function, cardiovascular regulation, and gastrointestinal physiology. This localization pattern is consistent with previously reported studies of PPmediated effects at 1) brainstem sites (McTigue et al., 1993; Whitcomb et al., 1990), 2) on arterial blood pressure (Wager-Page et al., 1993a) and 3) on gastric acid secretion and gastrointestinal motility (McTigue et al, 1993; Wager-Page et al, 1993b. A more definitive localization of the Y4 receptor mRNA and receptor expression whether on enterocytes, vascular smooth muscle cells, neurons, etc.) is attainable through in situ hybridization and receptor autoradiography techniques. There are to applicants' knowledge no published reports of PP receptor localization in human tissue as obtained through binding or functional studies. It may be informative, however, to compare the human Y4 macrolocalization data presented here with PP receptor characterization in the rat. PP receptors have been described, for example, in brainstem nuclei such as the area postrema, interpeduncular nucleus, dorsomedial nucleus, and the nucleus tractus solitarius (Whitcomb et al., 1990), consistent with the identification of Y4 mRNA in human brain. The PP receptors in rat brain stem are accessible to circulating PP, which is released upon Svagal stimulation of the pancreas during feeding (Whitcomb et al,, 1990). Activation of brainstem PP receptors inhibits further pancreatic secretion, n increases gastric acid sepretion, enhances gastric Kri 7 P-l L- _Isl 'WO 95/17906 PCT/US94/14436 -81motility, and increases gastric emptying time (Louie et al., 1985; McTigue and Rogers, 1993). A Y4 receptor antagonist then, would be expected to slow down gastric emptying time and potentially reduce meal size.

Given the similarities in pharmacologic profiles between the published PP receptor and the hp25a human Y4 receptor, it would be tempting to call hp25a the human PP receptor. Applicants believe that calling hp25a the human PP receptor, however, would be misleading. This is because the relatively compressed window of affinity for PP, PYY, and NPY (0.02 nM Ki 1.5 nM) makes hp25a a potential target for all three peptide ligands. Future localization experiments may help resolve the relationship between hp25a and the PP receptor.

Applicants propose that hp25a be known as the Y4 receptor. The name is not biased toward any one member of the pancreatic polypeptide family. The has its roots in the original classification of Y1 and Y2 receptor subtypes (Wahlestedt et al., 1987). The letter reflects the conservation in pancreatic polypeptide family members of the C-terminal tyrosine, described as in the single letter amino acid code.

Applicants note that the cloned human Y1 receptor was introduced by Larhammar and co-workers as a "human neuropeptide Y/peptide YY receptor of the Y1 type", with peptide ligands listed in rank order of affinity (Larhammar et al., 1992). Similarly, hp25a could be described as a human pancreatic polypeptide/peptide YY/neuropeptide Y receptor of the Y4 type.

is to applicants' knowledge the first "Y type" receptor to be cloned from a subtype family other than Yl. The reported Y3 receptor cloned from bovine brain -i (Rimland et al., 1991) was later described as having r lrr- rrr rrr rl r-r ~r rr S'WO 95/17906 PCTIUS94/1443 6 -82been misidentified (Jazin et al., 1993; Herzog et al., 1993). A Y2-like receptor (PR4) was cloned from drosophila and characterized using mammalian analogs of NPY (Li et al., 1992); however, the classification of this receptor is controversial. The receptor was relatively insensitive to NPY; concentrations ranging from 0.3 to 10 iM were required to elicit calcium mobilization in oocytes injected with PR4 mRNA (Li et al., 1992). The receptor also displayed a rank order of potency for NPY analogs distinct from that observed in mammalian systems (Wahlestedt et al., 1993; Li et al., 1992). Furthermore, an NPY analog has not been isolated from drosophila (Wahlestedt et al., 1993). It -i is possible that an unidentified ligand in drosophila j can activate PR4 more readily than NPY, and as such, the receptor may eventually be reclassified.

The cloning and expression of a Y4 (hp25a) receptor represents a major advance in the ability to analyze numerous physiological processes mediated by the pancreatic polypeptide family. Binding sites for PP, PYY, or NPY have a widespread anatomical distribution in peripheral targets such as neuromuscular junction, smooth muscle, stomach chief cells, intestinal enterocytes, kidney proximal tubule, and fat cells (Dumont et al., 1992; Castan et al., 1992). These receptors are therefore in a position to potentially regulate a variety of physiological functions including cognition, circadian rhythm, EEG synchronization, body temperature, blood pressure, locomotor activity, neuroendocrine release, sexual/reproductive behavior, feeding, sympathetic activation, sensory transmission, gastrointestinal function, intestinal secretion, renal absorption, and cardiovascular function (Wahlestedt et al., 1993).

Y4 'receptors are an invaluable resource for drug SUBSTITUTE SHEET (RULE 261 b*~qL_ WO 95/17906 PCTUS94/14436 -83design. The pancreatic polypeptide family is potentially involved in several pathophysiological conditions including memory loss, depression, anxiety, epileptic seizure, pain, hypertension, locomotor problems, circadian rhythm disorders, eating/body weight disorders, sexual/reproductive disorders, nasal congestion, and diarrhea (Wahlestedt et al., 1993; Dumont et al., 1992). The available data implicate this receptor in the control of obesity and other disorders of feeding including bulimia and anorexia.

The chemical synthesis of selective drugs not only for Y4 but for all "Y type" receptors will be greatly accelerated by preliminary screening against a homogeneous population of cloned human Y4 receptors.

As more specific pharmacological tools become available for probing receptor function, additional therapeutic indications are likely to be discovered.

Applicants do not know whether hp25a represents the single Y4 receptor expressed in the human genome, or whether there exists a group of structurally related Y4 receptor subtypes. This is an issue which can be resolved using nucleotide sequences from Y4 receptor as the basis for in situ localization, antisense or "knockout" strategies, homology cloning, and related techniques. Such approaches will enable one to investigate the existence of potentially novel receptor subtypes with pharmacologic and therapeutic significance.

In conclusion, the primary structure of the proteins encoded by hp25a (Y4) gene and its homolog in the rat, i as well as its unique pharmacological profile obtained for the Y4 receptor subtype, indicate that these genes represent a new pancreatic polypeptide receptor subfamily. Additional cloning efforts will be required to isolate additional members of this newly recognized -3 1 P:\OPER\MRO\15518-95006- 611/99 i f -84neuropeptide receptor family.

Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the incluion of a stated integer or step or group of integers or steps but not the exclusion of any other integer or step or group of integers or steps.

4e i

I

:i *4 i t 0

I

i

S

t .4 6

S

4 6 «a II tL ?f B -a .i fl« _a~L I 'WO 95/17906 PCT/US94/14436

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SWO 95/17906 PCTiUS94/14436 -86- Bradford, M.M. A rapid and sensitive method for the quantitation of microgram quantities of protein utilizing the principle of protein-dye binding. Anal.

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Dumont, Martel, A. Fournier, S. St.-Pierre, .9 SUBSTITUTE SHEET (RULE 26) s L1-l ILI SL_ I-IIL~L~ 'WO 95/17906 PCTUS94/14436 -87and R. Quiron. Nuuropeptide Y and neuropeptide Y receptor subtypes in brain and peripheral tissues.

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Eva, K. Keinanen, H. Monyer, P. Seeburg, and R.

Sprengel. Molecular cloning of a novel G proteincoupled receptor that may belong to the neuropeptide receptor family. FEBS Lett. 271:80-84 (1990).

Fuhlendorff, N. Langeland Johansen, S.G. Melberg, H. Thogersen, and T.W. Schwartz. The antiparallel pancreatic polypeptide fold in the binding of neuropeptide Y to Y1 and Y2 receptors. J. Biol.

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Fuhlendorff, U. Gether, L. Aakerlund, N.

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[Leu 3 ,Pro 4 ]Neuropeptide Y: A specific Y 1 receptor agonist. Proc. Natl. Acad. Sci. USA 87: 182-186 (1990) Glover, D.J. Barlow, J.E. Pitts, S.P. Wood, I.J. Tickle, T.L. Blundell, K. Tatemoto, J.R. Kimmel, A. Wollmer, W. Strassburger, and Zhang.

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-U

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Herzog, Y.J. Hort, J. Shine, and L.A. Selbie.

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Nakajima, T. Inoue, and S. Baba. Characterization of the receptor for peptide-YY and avian pancreatic polypeptide in chicken and pig brains. Endocrinology 127:934-941 (1990).

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Jorgensen, J. Fuhlendorff, and T.W. Schwartz.

Structure/function studies on neuropeptide Y and pancreatic polypeptide evidence for two PP-fold s MTITI FFT RI 11 F 9R) WO 95/17906 PCTIUS94/14436 -89receptors in vas deferens. Eur. J. Pharmac. 186: 105- 114 (1990).

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Cloning, functional expression, and developmental regulation of a neuropeptide Y receptor from drosophila melanogaster. J. Biol. Chem. 267: 9-12 (1992) L" opata, M. Cleveland, D. and Sollner-Webb, B.

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1ZIrT TrrF R14FFT (RI IF M6 WO 95/17906 PCTIUS94/14436 -94- SEQUENCE LISTING GENERAL INFORMATION: APPLICANT: Bard, Jonathan A.

Walker, Mary Branchek, Theresa Weinshank, Richard L.

(ii) TITLE OF INVENTION: DNA ENCODING A HUMAN NEUROPEPTIDE Y/PEPTIDE YY/PANCREATIC POLYPEPTIDE RECEPTOR (Y4) AND USES THEREOF (iii) NUMBER OF SEQUENCES: 28 (iv) CORRESPONDENCE ADDRESS: ADDRESSEE: Cooper Dunham STREET: 1185 Avenue of the Americas CITY: New York STATE: New York COUNTRY: U.S.A.

ZIP: 10036 COMPUTER READABLE FORM: MEDIUM TYPE: Floppy disk COMPUTER: IBM PC compatible OPERATING SYSTEM: PC-DOS/MS-DOS SOFTWARE: PatentIn Release Version #1.25 (vi) CURRENT APPLICATION DATA: APPLICATION NUMBER: FILING DATE:

CLASSIFICATION:

(viii) ATTORNEY/AGENT INFORMATION: NAME: White, John P.

REGISTRATION NUMBER: 28,678 REFERENCE/DOCKET NUMBER: 44743-A-PCT\JPW\MAT (ix) TELECOMMUNICATION INFORMATION: TELEPHONE: (212) 278-0400 TELEFAX: (212) 391-0525 INFORMATION FOR SEQ ID NO:1: SEQUENCE CHARACTERISTICS: j LENGTH: 1320 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (ix) FEAIURE: NAME/KEY: ipS LOCATION: 8, .1212 (xi) SEQUENCE DESCRIPTION: SEQ ID NO:1: S AGTATTGTTT GTCTGTTTGC CTTGTAGGGC GTCATCCCTC A.GTGTATCA CTTAGTTCAA GAGTCCTGGA ATCTTTTCAC ATCCAL" ATG AAC ACC TCT CAC CTC CTG GCC 111 Met Asn Thr Ser His Leu Leu Ala SViTSj1~JJ~'91~LLF1~1JJirTh L~.

~WO 95117906 PCTIUS94/14436 TTG CTG Leu Leu GGC ACC Gly Thr

ATG

Met

CTG

Leu

GCC

Ala

CTC

Leu

GAC

Asp 105

CAG

Gin

CTG

Leu

ATC

Ile

GTC

Val

CAC

His 185

TGT

Cys

TTC

Phe

TGT

Cys

CAC

His Val; 265 GTC TTC ATC Val Phe Ile GGT AAC CTC Giy Asp, Leu AAC GTG ACC Asn Val Thr ATG TGC CTC Met Cys Leu TAC TGG ATC Tyr Trp Ile TGC ATCG TCG Cys Met Ser GAG AGG CAT Giu Arg His 140 TCA CAG GCC Ser Gin Ala 155 CTC TCC CTG Leu Ser Leu

AAA~

Lys

AAC

AsnI

GTC

Vai

TGC

Cys

AAC

Asn

CTC

Leu

TTT

Phe

GTG

Vali 125

CAG

Gin

TAC

Tyr Ccc Pro 1 CAA GGT Gin Giy GAA CAT Giu His TAC AGC Tyr Ser TGT GTG Cys Val T TC GCC Ile Aia 80 CCG CTG Pro Leu ACC CTC Thr Leu TCC ATC Ser Ile Giu Asn TGC CAG Cys Gin 35 ATT GAG Ile Giu 50 ACT GTG Thr Vai AAC CTG Asn Leu ACC GCC Thr Aia TGC AAG Cys Lys 115 CTC TCG Leu Ser 130 CCA ACA Pro Thr Ser

TCC

Ser

GTC

Vai

CAG

Gin

TTC

Phe

TAC

Tyr

TCC

Ser GAA AAC AGA AGC AAA CCC CTG Lys Pro Leu GTG GAC GTG Val Asp Val GTG GGG GTC Vai Giy Val AAG GAG AAA Lyo Giu Lys TCT GAC TTC Ser Asp Phe ACC ATC ATG Thr Ile Met 2~55 351

GCC

Ala ATC ATC AAC Ile Ile Asn 145 170

AAG

Lys

ACC

Thr

CTG

Leu

TAT

Tyr

AAG

Lys 250

GTG

Val

AAC

Asn

GAG

Giu

CTC

Leu

GCA

Ala 235

GGC

Giy

CTG

Leu CTG GGG Leu Gly TTC CTG Phe Leu 175 AAG GCT Lys Ala 190 CCA CTG Pro Leu CAG TAC Gin Tyr TAC CGG Tyr Arg AGC TTG Ser Leu 235 ATG GTG Met Val 270

ATT

Ile GTG CTC ATC Vai Leu Ile AAC AGC ATC Asn Se Ile GAG TTC CTG Giu Phe Leu 195 CAC CAC CGC His His Arg 210 CTC CCA CTG Leu Pro Leu 225 CT'2 CAG AGG Leu Gin Arg GCT GGG CAC Ala Gly His GCC TTT GCC Ala Phe Ala 275 CTC GTC CTC Leu Val Leu GGC TOG AAG Gly Trp Lys 150 TGG GTC ATT Trp Vai Ile 165 CTG GAG AAT Leu Giu Asn 180 GCA GAT AAG Ala Asp Lys ACC ATC TAC Thr Ile Tyr GGC TTC ATC Gly Phe Ile 230 CAG GGG CGC Gin Giy Arg 245, ATG AAG CAG Met Lys Gin 260 GTG CTC TG Val Leu Trp TTC ATC Phe le 120 GTG GCC Val Ala 135 CCC AGC Pro Ser 0CC TOT Ala Cys GTC TTC Val Phe GTG GTC Val Val 200 ACC ACC Thr Thr 215 CTG GTC Leu Val 783 mm.. .r a. a. as.

A

IL

'WO 95/17906 PCTIUS94/14436 -96- CTG CAT GTG TTC AAC AGC CTG GAA GAC TGG CAC Leu His Val Phe Asn Ser Leu Giu Asu Trp His 285 290 ATC TGC CAC GGG AAC CTC ATC TTC TTA GTG TGC Ile Cys His Gly Asn Leu Ile Phe Leu Val. Cys 300 305 GCC TCC ACC TGC GTC AAC CCA TTC ATC TAT GGC Ala Ser Thr Cys Val Asn Pro Phe Ile Tyr Gly 315 320 TTC AAG' AAG GAG ATC AAG GCC CTG GTG CTC, ACT Phe Lys Lys Glu Ile Lys Ala Leu Val. Leu Thr 330 335 CCC CTG GAG GAG TCG GAG CAT CTG CCC CTG TCC Pro Leu Giu Glu Ser Giu His Leu Pro Leu Ser 345 350 355 GTC TCC AAA GGG TCC CTG AGG CTA AGT GGC AGG Val Ser Lys Gly Ser Leu Arg Leu Ser Gly Arg 365 370 TAACCAGGTC TAGGTCTTCT CCCTGCCATG TCCCTTGCCA TGGGCACACT GCAAGCTGGG GTGGCACCCC AGCATTCCTG INFORMATION FOR S7,Q ID NO:2: SEQUENCE CHARACTERISTICS: LENGTH: 375 amino acids TYPE: amino acid TOPOLOGY: linear CAT GAG GCC ATC CCC His Giu Ala Ile Pro 295 CAC TTG CTT GCC ATG His Leu Leu Ala Met 310 TTT CTC AAC ACC A-AC Phe Leu Asn Thr Asn 325 TGC CAG CAG AGC GCC Cys Gin Gin Ser Ala 340 ACA GTA CAT ACG GAA Thr Vai His Thr Giu 360 TCC AAT CCC ATT Ser Asn Pro Ile 375 GGCTCTTCCA CTTAGCTAAG

GCTTTCTG

1023 1071 1119 1167 12 12 1272 1320

A

I

.1 (ii) MOLECULE TYPE: protein (xi) SEQUENCE Met Asn Thr Ser His 1 5 Gly Giu Asn Arg Ser His Cys Gin Asp Ser Ser Ile Giu Thr Val s0 Val Thr Val Arg Gin Ala Asn Leu Ala Phe Leu Thr Ala Val Tyr 100 Leu Cys Lys Met Ser 115 Ile Leu Ser Leu Val -130 Asn Pro Thr Gly Trp 145 DESCRIPTION: SEQ ID Leu Leu Ala Leu Leu 10 Lys Pro Leu Gly Thr 25 Val Asp Vai Met Val Val Gly Vai Leu Gly Lys Giu Lys Ala Asn 70 Ser Asp Phe Leu Met 90 Thr Ile Met Asp Tyr 105 Ala Phe Ile Gin Cys 120 Leu Val Ala Leu Giu 135 Lys Pro Ser Ile Ser 150 NO: 2: Leu P Pro T Phe I Asn L Val T Cys L Trp I Met S Arg H 155 Ser Pro is Phe Ser Thr Ser Leu Met Leu Leu Cys Gin Gly Giu 110 Thr Val Leu Ile Leu Gly i~~rr\It. OSPJ-- to" u fr t Cl--I l S 7-i Cli- I i

II

C*na i 'WO 95/17906 PCT/US94/14436 -97- Val Leu Ile Trp Val Ile Ala Cys Val Leu Ser Leu Pro Phe Leu Ala Asn Glu His Leu.

225 Leu Ala Ala Asp Leu 305 Ile Val Pro Ser Ile Leu 195 Arg Leu Arg His Ala 275 His Cys Gly Thr Ser 355 Arg INFORMATION FOR SEQ ID NO:3: SEQUENCE CHARACTERISTICS: LENGTH: 45 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:3: TTGCTTATGG GGCTGTGATT ATTCTTGGGG TCTCTGGAAA CCTGG INFORMATION FOR SEQ ID NO:4: SEQUENCE CHARACTERISTICS: LENGTH: 45 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) i f ;i ii 'i j SWO 95/17906 PCT/US94/14436 -98- (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: YES (xi) SEQUENCE DESCRIPTION: SEQ ID NO:4: TAGGATGATT ATGATCAATG CCAGGTTTCC AGAGACCCCA AGAAT INFORMATION FOR SEQ ID SEQUENCE CHARACTERISTICS: LENGTH: 45 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID AAAGAGATGA GGAATGTCAC CAACATTCTG ATCGTGAACC TCTCC INFORMATION FOR SEQ ID NO:6: SEQUENCE CHARACTERISTICS: LENGTH: 4!5 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: YES (xi) SEQUENCE DESCRIPTION: SEQ ID NO:6: CAGCAAGTCT GAGAAGGAGA GGTTCACGAT CAGAATGTTG GTGAC INFORMATION FOR SEQ ID NO:7: SEQUENCE CHARACTERISTICS: LENGTH: 54 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL:

NO

(iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:7: TGCAAACTGA ATCCTTTTGT GCAATGCGTC TCCATTACAG TATCCATTTT CTCT 54 0 0. 1 eEiliC;j 71 -n3, WO 95/17906 PCT/US94/14436 -99- INFORMATION FOR SEQ ID NO:8: SEQUENCE CHARACTERISTICS: LENGTH: 54 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: YES (xi) SEQUENCE DESCRIPTION: SEQ ID NO:8: ACGTTCACAA GCGATGAGAA CCAGAGAGAA AATGGATACT GTAATGGAGA CGCA INFORMATION FOR SEQ ID NO:9: SEQUENCE CHARACTERISTICS: LENGTH: 42 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:9: CTGCAGTATT TTGGCCCACT CTGTTTCATA TTCATATGCT AC

A

;j L i i INFORMATION FOR SEQ ID SEQUENCE CHARACTERISTICS: LENGTH: 42 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: YES (xi) SEQUENCE DESCRIPTION: SEQ ID CAAGCGAATG TATATCTeGA AGTAGCATAT GAATATGAAA CA INFORMATION FOR SEQ ID NO:11: SEQUENCE CHARACTERISTICS: LENGTH: 48 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO y: WO 95/17906 PCT/US94/14436 -100- (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:11: CTGCTCTGCC ACCTCACGGC CATGATCTCC ACCTGCGTCA ACCCCATC 48 INFORMATION FOR SEQ ID NO:12: SEQUENCE CHARACTERISTICS: LENGTH: 48 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: YES (xi) SEQUENCE DESCRIPTION: SEQ ID NO:12: GAAATTTTTG TTCAGGAATC CATAAAAGAT GGGGTTGACG CAGGTGGA 48 INFORMATION FOR SEQ ID NO:13: SEQUENCE CHARACTERISTICS: LENGTH: 47 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPF: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:13: TCATCGTCAC TTCCTACAGC ATTGAGACTG TCGTGGGGGT CCTGGGT 47 INFORMATION FOR SEQ ID NO:14: SEQUENCE CHARACTERISTICS: LENGTH: 46 base pairs TYPE: nucleic acid STRANDEDNESS: sianle TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:14: ACAGTCACAC ACATCAGGCA GAGGTTACCC AGGACCCCCA CGACAG 46 INFORMATION FOR SEQ D Q) M(T1n mt CuCCT Im 11 T 'WO 95/17906 PCT/US94/14436 -101- SEQUENCE CHARACTERISTICS: LENGTH: 45 base Dairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID TGCTTATCGC CAACCTGGCC TTCTCTGACT TCCTCATGTG CCTCC INFORMATION FOR SEQ ID NO:16: SEQUENCE CHARACTERISTICS: LENGTH: 45 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO i

I

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:16: TAGACGGCGG TCAGCGGCTG GCAGAGGAGG CACATGAGGA AGTCA INFORMATION FOR SEQ ID NO:17: SEQUENCE CHARACTERISTICS: LENGTH: 45 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:17: TGTCGGCCTT CATCCAGTGC ATGTCGGTGA CGGTCTCCAT CCTCT INFORMATION FOR SEQ ID NO:18: SEQUENCE CHARACTERISTICS: LENGTH: 45 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) I

\I

r -~sn~ 'WO 95/17906 PCTIUS94/14436 -102- (iii) (iv) HYPOTHETICAL: NO ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:18: CTCTCCAGGG CCACGAGGAC GA.GCGAGAGG ATGGAGACCG TCACC INFORMATION FOR SEQ ID NO:19: SEQUENCE CHARACTERISTICS: LENGTH: 45 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:19: GCCTACCTGG GGATTGTGCT CATCTGGGTC ATTGCCTGTG TCCTC INFORMATION FOR SEQ ID SEQUENCE CHARACTERISTICS: LENGTH: 45 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID NOQ2: TGCTGTTGGC CAGGAAGGGC AGGGAGAGGA CACAGGCAAT GACCC INFORMATION FOR SEQ ID NO:21: SEQUENCE CHARACTERISTICS: LENGTH: 45 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO |i

I;

IP

(xi) SEQUENCE DESCRIPTION: SEQ ID NO:Z1: S95PCT/US94/1443 6 WO 95/17906 -103- CATCTACACC ACCTTCCTGC TCCTCTTCCA GTACTGCCTC CCACT INFORMATION FOR SEQ ID NO:22: SEQUENCE CHARACTERISTICS: LENGTH: 45 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:22: TGCATAACAG ACCAGGATGA AGCCCAGTGG GAGGCAGTAC TGGAA INFORMATION FOR SEQ ID NO:23: SEQUENCE CHARACTERISTICS: LENGTH: 46 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:23: CTGGTGGTGA TGGTGGTGGC CTTTGCCGTG CTCTGGCTGC CTCTGC 46 INFORMATION FOR SEQ ID NO:24: SEQUENCE CHARACTERISTICS: LENGTH: 45 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:24: CAGTCTTCCA GGCTGTTGAA CACATGCAGA GGCAGCCAGA GCACG INFORMATION FOR SEQ ID SEQUENCE CHARACTERISTICS: LENGTH: 45 base pairs TYPE: nucleic acid WO 95/17906 PCT/US94/14436 -104- STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID ATCTTCTTAG TGTGCCACTT GCTTGCCATG GCCTCCACCT GCGTC INFORMATION FOR SEQ ID NO:26; SEQUENCE CHARACTERISTICS: LENGTH: 45 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (xi) SEQUENCE DESCRIPTION: SEQ ID NO:26: TGAGAAAGCC ATAGATGAAT GGGTTGACGC AGGTGGAGGC CATGG INFORMATION FOR SEQ ID NO:27: SEQUENCE CHARACTERISTICS: LENGTH: 1439 base pairs TYPE: nucleic acid STRANDEDNESS: single TOPOLOGY: linear (ii) MOLECULE TYPE: DNA (genomic) (iii) HYPOTHETICAL: NO (iv) ANTI-SENSE: NO (ix) FEATURE: NAME/KEY: CDS LOCATION: 178,.1306 (xi) SEQUENCE DESCRIPTION: SEQ ID NO:27: ATAGCTCTCA AGCCATAAGA TATAAGTAGC TAAGAATTGT CTCCL1CTCC CTGTCCCTTG TTCTTACCTG GTTCCATTTT ACATGCCTGG ACCTTTGAGT TCCATTTGTT TGTTTTGCAG 120 GACACTCA GAAGTGGGCC CTTTAGTCTT GAAGTTCCTG GTCTTCTCAC ACCCACC 177 ATG AAT ACC TCT CAT CTC ATO GCC TCC CTT TCT CCG GCA TTC CTA CAA 225 Met Asn Thr Se- His Leu Met Ala Ser LeU Ser Pro Ala Phe Leu Gin 1 5 10 GGT AAG AAT GGG ACC AAC CCA CTG GAT TCC CTC TAT AAT CTC TCT GAC 273 -r m I.V4. ^I *WO 95/1790 6 PTU9/4 PCT[US94/14436 -105- Asn

CAG

Gin

GAG

Giu

ACA

Thr

CTG

Leu

GTC

Val1 Pro Leu Aso GAT CTG TTG Asp Leu Leu 321 TTG ATA TTT Leu :1e Phe CTA CTC ATT Leu Leu Ile so TGC CAG CCG Cys Gin Pro GGC GAA GTC Gly Giu Vai 1120 ACA GTC TCC Thr Val Ser CTC ATT ATC Leu Ile Ile CTT TGC Leu Cys ATC CTC Ile Leu 1.30 AAC CCG Asn Pro 2.45 GTG GTC Vai Vai AAT AGC Asn Ser GAG TTT Giu Phe CAC CAC His His 210 GTC CCT Vai Pro 225 CTG CAG Leu Gin GTG GGG Val Gly GCC TTT Ala Phe

AAG

Lys 1125 rCA Ser

ACT

Thr

ATC

Ile

ATC

Ile

CTG

Leu 2.95

CGC

Arg

CTG

Leu

AGG

Arg

CAG

Gih

GCA

Ala 275 TTA ACG TTC Leu Thr Phe GTC CTT GTG Vai Leu Vai 2.35 TGG AAA CCC Trp Lys Pro 2.50 TTC ATT TCT Phe Ile Ser 165 AAC GAC CTC Asn Asp Leu GAC AAG GTT Asp Lys Val ATC TAC ACC Ile Tyr Thr 22.5 TTC ATC CTG Phe Ile Leu 230 AGG CGT GCG Arg Arg Ala 245 AAG CGG ATC Lys Pro Ile CTC TGG CTG Leu Trp Leu TGT ATG TCG Cys Met Ser

GCC

Ala

AGC

Ser

TGT

Cys

TTC

Phe

GTC

Val2 200

ACC

Thr

GTC

Val

TTC

Phe

AAT

Asn

CCC

Pro 280

CCT

Pro CTG GAG Leu Giu ATT TCC Ile Ser 561.

609 657 705 753

TTG

Leu

CAC

His

TCC

Ser

CTC

Leu 220

CGT

Arg

ACT

Thr

A:TG

Met

TTC

Phe CTG GGG Leu Giy TTC CTG Phe Leu 2.75 AAG GTT Lys Vpi 1.90 TCC TCG Ser Ser CAA TAC Gin Tyr 1.041.

i089 GAC TGG TAC CAG Asp Trp Tyr Gin 290 CAA GCC ATC Giu Ala Ile 295 TGC CAT GGC AAC CTC ATC TTC Cys His Gly Asn Leu Ile Phe 300 OiML-rmrr r iUr-r im u r ri 'WO 95/17906 PCT1US94/14436

AW

-106- TTG ATG TGC CAC CTG TTT GCC ATG GCT TCC ACC TGT GTC AAC CCT TTC Leu Met Cys His Leu Phe Ala Met Ala Ser Thr Cys Val Asn Pro Phe 305 310 315 320 ATC TAT GGC TTT CTC AAC ATC AAC TTC AAG AAG GAC ATC AAG OCT CTG Ile Tyr Giy Phe Leu Asn Ile Asn Phe Lys Lys Asp Ile Lys Ala Leu 325 330 335 OTT CTG ACC TGC CGT TGC AGG CCA CCT CAA GGG GAG CCT GAG C'CT CTG Val Leu Thr Cys Ar~g Cys Arg Pro Pro Gin Gly Giu Pro Giu Pro Leu 340 345 350 CCC CTG TCC ACT ;3TG CAC ACG GAC CTC TCC AAG GGA TCT ATG AGG ATG Pro Leu Ser Thr Val. His Thr Asp Leu Ser Lys Gly Ser Met Arg Met 355 360 365 GGT AGC AAG TCT AAC GTC ATG TAG T CATGTCTAGG CTCTTCCGCC Giy Ser Lys Ser Asn Val Met 370 375 ATTTCTTTCG ACACACCCTT TCACTGAGCTP AAGTAGALAC AATGCAAGCT GTGGTATCAT CCTGCCATTT CTGGTCTTTG GGGCCCAGAC AGGCGGCAAG AGACTTGAAG CTT INFORMATION FOR SEQ ID NO:28: SE7'UJENCE CHARACTERISTICS: LENGTH: 376 amino acids TYPE: amino acid TOPOLOGY: linear 1233 1281 1326 1386 1439 (ii) MOLECULE TYPE: protein Met 1 Gly Gly S er Vai Ala Leul Leu Ile Asn 145 Val (xi) SEQUENCE Asn Thr Ser His

S

Lys Asn Gly Thr Cys Gin Asp Ser Val Giu Thr Val s0 Thr Thr Arg Gin Asn Leu Ala Phe Thr Val Thr Tyr 100 Cys Lys Met Leu 115 Leu. Ser Leu Vai 130 Pro Thr Giy Trp, Val lie Trp Phe 165

DESCRIPTION:

Leu Met Ala Pro Leu Asp Leu Gly Val Giu Lys Asp Phe Ile Met Phe Ile 120 Val Ala 135 Pro Ser Ser Cys SEQ ID NO:28: Ser Leu Ser Pro Asp Ser Leu Tyr Leu Aia Phe Ile Leu Gly Asn Leu Ser Asn Vai Thr Leu Met Cys Leu Asp Tyr Tr-p Ile 105 Gin Cys Met Ser Leu Giu Arg His 140 Ile Ser Gi I a d ~eLeu/ i e 170/! His rjAgn His

I

175 Ser Lys Val Val Asn Ser Ile Leu Asn As'p Leu Phe 'WO 95/17906 PTU9/43 PCTfUS94/14436 -107- Glu His Val1 225 Leu Val Ala Asp tjeu 305 I le Val Pro Gly Li rro-y wrf P%i r-

Claims (27)

1. An isolated nucleic acid molecule encoding: a Y4 receptor protein comprising an amino acid sequence as set forth in Figure 1 or 3; or (ii) a protein having the same binding characterist's and comprising substantially the same amino acid sequence as t;-e Y4 receptor protein of

2. The isolated nucleic acid molecule of claim 1, wherein the nucleic acid is DNA.

3. The isolated DNA of claim 2, wherein the DNA is cDNA.

4. The isolated DNA of claim 2, wherein the DNA is genomic DNA. 9 t

5. The isolated nucleic acid of claim 1, wherein the nucleic acid is RNA.

6. The isolated nucleic acid molecule according to any one of claims 1 to wherein the protein encoded therefor comprising an amino acid sequence in the transmembrane region which has 60% or higher homology to the amino acid sequence in the transmembrane region of the human Y4 receptor set forth in Figure 1.

7. The isolated nucleic acid molecule according to any one of claims 1 to wherein the protein encoded therefor has substantially the same amino acid sequence as that set tbrth in Figure 1.

8. The isolated nucleic acid molecule according to any one of claims 1 to wherein the Y4 receptor protein encoded therefor comprises the amino acid sequence set forth in Figure 1. P:\OPER\MRO\5518-95.006 6/11/99 -109-

9. The isolated nucleic acid molecule according to any one of claims 1 to wherein the protein encoded therefor has substantially the same amino acid sequence as that set forth in Figure 3. The isolated nucleic acid molecule according to any one of claims 1 to wherein the Y4 receptor protein encoded therefor comprises the amino acid sequence set forth in Figure 3.

11. A purified or recombinant Y4 receptor protein comprising an amino acid sequence as set forth in Figure 1 or 3.

12. A vector comprising the isolated nucleic acid molecule of any one of claims 1-

13. The vector of claim 12 adapted for expression in a bacterial cell wherein said a vector comprises the regulatory elements necessary for expression of the nucleic acid molecule in said bacterial cell operatively linked to the nucleic acid molecule encoding the protein so as to permit expression thereof.

14. The vector of claim 12 adapted for expression in a yeast cell wherein said A vector comprises the regulatory elements necessary for expression of the i nucleic acid molecule in said yeast cell operatively linked to the nucleic acid molecule encoding the protein so as to permit expression thereof. The vector of claim 12 adapted for expression in an insect cell wherein said vector comprises the regulatory elements necessary for expression of the nucleic acid molecule in said insect cell operatively linked to the nucleic acid moleculeencoding the protein so as to permit expression thereof. R A Ia MI,~ P:\OPER\MRO\15518-95.(Y6 6/1/99 -110-

16. The vector of claim 15, wherein the vector is derived from a baculovirus.

17. The vector of claim 12 adapted for expression in a mammalian cell wherein said vector comprises the regulatory elements necessary for expression of the nucleic acid molecule in said mammalian cell operatively linked to the nucleic acid molecule encoding the protein so as to permit expression thereof.

18. The vector of claim 17, wherein the vector is derived from a plasmid.

19. The plasmid vector of claim 18 designated pcEXV-Y4 (ATCC Accession No. 75631).

20. The plasmid vector of claim 18 designated pcEXV-rY4 (ATCC Accession No. 75984).

21. A cell comprising the vector of any of claims 12-20.

22. The cell of claim 21, wherein the cell is a mammalian cell.

23. The cell of claim 22, wherein the mammalian cell is non-neuronal in origin. I 24. The cell of claim 23, wherein the mammalian cell of non-neuronal origin is a COS-7 cell. The cell of claim 23, wherein the mammalian cell of non-neuronal origin is a LM(tk-) cell.

26. The LM(tk-) cell of claim 25, designated L-hY4-3 (ATCC Accession No. CRL 11779). I /f^U i -a P:\OPER\MRO\15518-95.006- 6/1/99 I i 1 i; i i. i i 4 4. 4 to 4. C 0 4 OW6 a 498 o a a, C S.

111- 27. The cell of claim 23, wherein the mammalian cell of non-neuronal original is a NIH-3T3 cell. 28. The NIH-3T3 cell of claim 27, designated N-hY4-5 (ATCC Accession No. CRL 11778). 29. A nucleic acid probe comprising a nucleotide sequence of at least nucleotides in length capable of specifically hybridizing with a unique sequence of at least 15 nucleotides included within a sequence set forth in Figure 1 or 3. The nucleic acid probe of claim 29, wherein the nucleic acid is DNA, 31. The nucleic acid probe of claim 29, wherein the nucleic acid is RNA. 32. An antisense oligonucleotide having a sequence capable of specifically hybridizing to an mRNA encoded by the nucleic acid molecule according to any one of claims 1-10 so as to prevent translation of the mRNA. 33. The antisense oligonucleotide of claim 32 comprising chemical analogues of nucleotides. 34. An antibody that is capable of binding to a Y4 receptor comprising an amino acid sequence as set forth in Figure 1 or 3. The antibody of claim 34, wherein the antibody is a monoclonal antibody. 36. The monoclonal antibody of claim 35 directed to an epitope of a Y4 receptor protein present on the surface of a Y4 receptor expressing cell. 37. A pharmaceutical composition comprising a pharmaceutically-acceptable carrier 'A ^F L, r^ C I-I i" Vi P:\OPER\MRO\15518-95.006 611/99

112- capable of passing through the cell membrane and the oligonucleotide of claim 32 or 33 in an amount that is effective to decrease activity of a Y4 receptor by passing through a cell membrane and binding specifically with mRNA encoding a Y4 receptor protein in the cell so as to prevent translation of said mRNA. 38. The pharmaceutical composition of claim 37, wherein the oligonucleotide is coupled to a substance which inactivates mRNA. 39. The pharmaceutical composition of claim 38, wherein the substance which inactivates mRNA is a ribozyme. 40. The pharmaceutical composition according to any one of claims 37 to 39, wherein the pharmaceutically-acceptable carrier comprises a moiety which binds to a receptor on a cell and is capable of being taken up by such cell after binding to the receptor. a.i 41. The pharmaceutical composition of claim 40, wherein the receptor to which the moiety binds is specific for a preselected cell type. 42. A pharmaceutical composition comprising an amount of the antibody of any of claims 3,-36 effective to block binding of a ligand to a Y4 receptor protein and a pharmaceutically acceptable carrier. 43. A transgenic, nonhuman mammal comprising the isolated nucleic acid molecule according to any one of claims 1 to 10 introduced into its genome or the progeny thereof comprising said nucleic acid molecule. 44. The transgenic, nonhuman mammal of claim 43 comprising a homologous recombination knockout of the native Y4 receptor protein, wherein the introduced nucleic acid molecule encodes a Y4 receptor protein having an n! RA4 .jo 'c- 44 .46 4 4a 04 &4 01 0 4 4 4 4 *r 4 *4J a a *J 4 '9 4 P:\OPER\MRO\ 15518-95.006- 611/99 -113- amino acid sequence that is homologous to that set forth in Figure 1 or 3. The transgenic, nonhuman mammal of claim 43 wherein the introduced nucleic acid molecule comprises DNA encoding an antisense nucleic acid complementary to RNA encoding a Y4 receptor protein and wherein said DNA is placed in the genome of said mammal so as to be transcribed into antisense nucleic acid capable ,f hybridizing to said RNA. 46. The transgenic, nonhuman mammal according to any one of claims 43-45, wherein the isolated nucleic acid molecule is placed operably under the control of an inducible promoter in the genome of said mammal. 47. The transgenic, nonhuman mammal according to any one of claims 43-46, wherein the isolated nucleic acid molecule operatively linked to one or more tissue specific regulatory elements. 48. The transgenic, nonhuman mammal according to any one of claims 43-47, being a mouse. 49. A method of identifying a compound which binds specifically to a Y4 receptor, said method comprising the steps of contacting a cell that is transfected with and expresses the nucleic acid molecule according to any one of claims 1-10 with said compound for a time and under conditions sufficient to permit the binding of compounds to said receptor, and detecting the presence of said compound bound specifically to said receptor. The method of claim 49, wherein the Y4 receptor is a human Y4 receptor protein having a sequence as set forth in Figure 1. 51. The method of claim 49, wherein the Y4 receptor is a rat Y4 receptor protein 1 1 !I i i i I: $t\ i i )S At 1 L -qF P\OPER\MRO\15518-95.006- 611/99 -,114- having a sequence as set forth in Figure 3. 52. A method of identifying a compound which binds specifically to a Y4 receptor, said method comprising the steps of contacting a membrane fraction from cells transfected with and expressing a nucleic acid according to any of claims 1-10, with the compound for a time and under conditions sufficient to permit the binding of compounds to such receptor, and detecting the presence of said compound bound to said receptor. 53. The method of claim 52, wherein the Y4 receptor is a human Y4 receptor i protein having a sequence as set forth in Figure 1. 54. The method of claim 52, wherein the Y4 receptor is a rat Y4 receptor protein I having a sequence as set forth in Figure 3. I 55. The method according to any one of claims 49-54, wherein the compound was not previously known to specifically bind to a Y4 receptor. 56. A method of identifying a Y4 receptor agonist comprising the steps of contacting Jt cells transfected with and expressing the nucleic acid molecule according to any a t one of claims 1-10 with a compound being tested for Y4 receptor agonist activity for a time and under conditions sufficient to permit the activation of a I functional Y4 receptor response from said cells, and detecting by means of a bioassay an increase in Y4 receptor activity in the presence of said compound as compared to Y4 receptor activity in the absence of said compound. 57. A method of identifying a Y4 receptor agonist comprising the steps of contacting a membrane fraction from cells transfected with and expressing the nucleic acid molecule according to any one of claims 1-10 with a compound being tested for Y4 receptor agonist activity for a time and under conditions sufficient to permit i i o L^ 1 I JL---t _-CT T -_I1~ C .d i I P:\OPER\MRO\15518-95.006 6/1/99 a a C Y CC C C 4,c lx A -115- the activation of a functional Y4 receptor response, and detecting by means of a bioassay an increase in Y4 receptor activity in the presence of said compound as compared to the Y4 receptor activity in the absence of said compound. 58. A method of identifying a Y4 receptor antagonist comprising the steps of contacting cells transfected with and expressing the isolated nucleic acid molecule according to any one of claims 1-10 with a compound being tested for Y4 receptor antagonist activity in the presence of a known Y4 receptor agonist for a time and under conditions sufficient to permit the activation of a functional Y4 receptor response, and detecting by means of a bioassay a decrease in Y4 receptor activity in the presence of said compound as compared to the Y4 receptor activity in the absence of said compound. 59. A method of identifying a Y4 receptor antagonist comprising the steps of contacting a membrane fraction from cells tvx. nsfected with and expressing the isolated nucleic acid according to any one of claims 1-10 with a compound being tested for Y4 receptor antagonist activity in the presence of a known Y4 receptor agonist for a time and under conditions sufficient to permit the activation of a functional Y4 receptor response, and detecting by means of a bioassay a decrease in Y4 receptor activity in the presence of said compound as compared to the Y4 receptor activity in the absence of said compound. The method of claim 58 or claim 59 wherein the known Y4 receptor agonist is PP. 61. The method according to any one of claims 56 to 60 wherein the Y4 receptor is a human Y4 receptor protein having a sequence as set forth in Figure 1. 62. The method according to any one of claims 56 to 60 wherein the Y4 receptor is a rat Y4 receptor protein having a sequence as set forth in Figure 3. 'U^ C)| 4'/ N 4- P1e z~i ::o x t L 'F ~c, u P:\OPER\MRO\15513-95.006- 6/1/99 -116- 63. The method according to any one of claims 56 to 62 wherein the bioassay comprises a second messenger assay. 64. The method of claim 63, wherein the second messenger assay comprises the measurement of intracellular cAMP. The method of claim 63, wherein the second messenger assay comprises the measurement of intracellular calcium mobilization, 66. The method according to any one of claims 49 to 65, wherein the cells transftcted with and expressing the nucleic acid molecule according to any one of claims 1 to 10 are mammalian cells. 67. The method of claim 66, wherein the mammalian cells are non-neuronal in .origin. 68. The method of claim 67, wherein the mammalian cells of non-neuronal origin are COS-7 cells. 69. The method of claim 67, wherein the mammalian cells of non-neuronal origin are CHO cells. The method of claim 67, wherein the mammalian cells of non-neuronal origin are LM(tk-) cells. *g 71. The method of claim 67, wherein the mammalian cells of non-neuronal origin are NIH-3T3 cells. 72. A method of screening to identify compounds which specifically bind to a Y4 RA4. r I 7 P:\OPER\MRO\15518-95.006 6/1/99 -117- receptor on the surface of a cell which method comprises contacting cells transfected with and expressing the nucleic acid molecule according to any one of claims 1-10 with a plurality of compounds for a time and under conditions sufficient to permit binding to the Y4 receptor, and determining from said plurality of compounds those compounds which bind specifically to the transfected cell. a ar a a 4 'ii'. 5' sail ar c A& 73. A method of screening to identify compounds which bind specifically to a Y4 receptor on the surface of a cell which method comprises contacting a membrane fraction from cells transfected with and expressing the nucleic acid molecule according to any one of claims 1-10 with a plurality of compounds for a time and under conditions sufficient to permit binding of compounds to the Y4 receptor, and determining from said plurality of compounds those compounds which bind specifically to the transfected cell. 74. The method of claim 72 or 73, wherein the Y4 receptor is a human Y4 receptor protein having a sequence as set forth in Figure 1. The method of claim 72 or 73, wherein the Y4 receptor is a rat Y4 receptor protein having a sequence as set forth in Figure 3. 76. A method of screening to identify compounds which act as agonists of a Y4 receptor which method comprises contacting cells transfected with and expressing the nucleic acid molecule according to any one of claims 1-10 with a plurality of compounds for a time and under conditions sufficient to permit the activation of a functional Y4 receptor response, and determining using a bioassay those compounds in said plurality of compounds which activate said receptor. 77. A method of screening to identify compounds which act as agonists of a Y4 k P:\OPER\MRO\15518-95.006- 6/1/99 -118- receptor which method comprises contacting a membrane fraction from cells transfected with and expressing the nucleic acid molecule according to any one of claims 1-10 with a plurality of compounds for a time and under conditions sufficient to permit the activation of a functional Y4 receptor response, and determining using a bioassay those compounds in said plurality of compounds which activate said receptor. 78. A method of screening to identify compounds which act as antagonists of Y4 receptors which method comprises contacting cells transfected with and expressing the nucleic acid molecule according to any one of claims 1-10 with a plurality of compounds in the presence of a known Y4 receptor agonist for a j time and under conditions sufficient to permit the activation of a functional Y4 *o receptor response, and determining using a bioassay those compounds in said ;plurality of compounds which inhibit the activation of the receptor that is produced by the known Y4 receptor agonist. 79. A method of screening to identify compounds which act as antagonists of Y4 j receptors which method comprises contacting a membrane fraction from cells transfected with and expressing the nucleic acid molecule according to any one of claims 1-10 with a plurality of compounds in the presence of a known Y4 S receptor agonist for a time and under conditions sufficient to permit the activation of a functional Y4 receptor response, and determining using a bioassay those compounds in said plurality of compounds which inhibit the activation of the receptor that is produced by the known Y4 receptor agonist. o* The method of claim 78 or claim 79 wherein the known Y4 receptor agonist is PP. 81. The method according to any one of claims 76 to 80, wherein the Y4 receptor AQ- is a human Y4 receptor protein having a sequence as set forth in Figure 1. I* P:\OPER\MRO\15518-95.006 6/1/99 -119- 82. The method according to any one of claims 76 to 80, wherein the Y4 receptor is a rat Y4 receptor protein having a sequence as set forth in Figure 3. 83. The method according to any one of claims 76 to 82 wherein the bioassay comprises a second messenger assay. 84. The method of claim 82, wherein the second messenger assay comprises the measurement of intracellular cAMP. The method of claim 82, wherein the second messenger assay comprises the measurement of intracellular calcium mobilization. 9* S* 86. The method according to any one of claims 72-85, wherein the cells transfected S. with and expressing the nucleic acid molecule according to any one of claims I 1 to 10 are mammalian cells. 87. The method of claim 86, wherein the mammalian cells are non-neuronal in origin, 88. The method of claim 87, wherein the mammalian cells of non-neuronal origin re COS-7 cells. 89. The method of claim 87, wherein the mammalian cells of non-neuronal origin S are CHO cells. The method of claim 87, wherein the mammalian cells of non-neuronal origin are LM(tk-) cells. 91. The method of claim 87, wherein the mammalian cells of non-neuronal origin RA I L U^ 7 I p:\OPER\MRO\15518-95,006 6/1199 -120- are NIH-3T3 cells. 92. A method of detecting expression of a Y4 receptor by a cell, said method comprising obtaining total mRNA from the cell and contacting said mRNA with the nucleic acid probe according to any one of claims 29 to 31 for a time and under conditions sufficient for hybridization to occur and then detecting mRNA hybridized to the probe. 93. A method of preparing a pharmaceutical composition which comprises identifying a compound by the method according to any one of claims 49-55 or claims 72-75, obtaining said compound and admixing the compound so obtained with a pharmaceutically acceptable carrier. 94. A method of preparing a pharmaceutical composition which comprises identifying a Y4 receptor agonist by the method according to any one of claims 56, 57, 76 or 77 or a claim appended thereto, obtaining said agonist and admixing said Y4 receptor agonist so obtained with a pharmaceutically acceptable carrier. 95. A method of preparing a pharmaceutical composition which comprises identifying a Y4 receptor antagonist by the method according to any one of claims 58, 59, 78 or 79 or a claim appended thereto, obtaining said Y4 receptor antagonist and admixing said Y4 receptor antagonist so obtained with a 0 pharmaceutically acceptable carrier. 96. A method of treating a subject suffering from an abnormality in Y4 receptor function which method comprises administering to the subject an effective amount of a pharmaceutical composition prepared by the method of claim 94 for a time and under conditions sufficient to activate a Y4 receptor in said Ssubject, so as to thereby treat the abnormality. R A4 C- P;\OPER\MRO\SS18-95,006 6/1/99 121 97. A method of treating a subject suffering from an abnormality in Y4 receptor function which method comprises administering to the subject an effective amount of a pharmaceutical composition prepared by the method of claim for a time and under conditions sufficient to antagonise a Y4 receptor in said subject, so as to thereby treat the abnormality. 98. The method of claim 96 or 97, wherein the abnormality is amnesia. 99. The method of claim 96 or 97, wherein the abnormality is a feeding disorder. 100. The method of claim 96 or 97, wherein the abnormality is epilepsy. 101. The method of claim 96 or 97, wherein the abnormality is hypertension. 102. The method of claim 96 or 97, wherein the abnormality is sleeping disorder. 103. The method of claim 96 or 97, wherein the abnormality is pain. ,bo, 9 104. A method of detecting the presence of a Y4 receptor on the surface of a cell which method comprises contacting the cell with the antibody according to any one of .aims 34 to 36 for a time and under conditions permitting binding of the antibody to the receptor, and detecting the presence of the antibody bound to the cell. 105. A method of determining the physiological effects of expressing varying levels of Y4 receptors in an animal subject which method comprises producing the transgenic nonhuman mammal according to any one of claims 43 to 48 wherein aid transgenic nonhuman mammal exhibits .f levels of human Y4 receptor expression that are varied by use of an :e 1 P:\OPER\MRO\15518-95.006- 611199 -122- inducible promoter which regulates Y4 receptor expression; and (ii) varying the level of expression of said human Y4 receptor. 106. A method of determining the physiological effects of expressing varying levels of Y4 receptors in an animal subject which method comprises: producing a panel of transgenic, nonhuman mammals each of which is the transgenic nonhuman mammal according to any one of claims 43 to 48 wherein each of said transgenic nonhuman mammals comprising said panel expresses a different amount of Y4 receptor; and (ii) determining the phenotype of a number of the transgenic nonhuman mammals comprising said panel. S 107. A method of identifying a Y4 receptor antagonist capable of alleviating an abnormality in a subject which method comprises: administering a Y4 receptor antagonist to the transgenic nonhuman mammal according to any one of claims 43 to 48 wherein said mammal t displays one or more physical and/or behavioural abnormalities associated with Y4 receptor activity; and (ii) determining whether said antagonist alleviates any of said physical and/or behavioural abnormalities displayed by the transgenic nonhuman mammal. 108. A method of identifying a Y4 receptor agonist capable of alleviating an abnormality in a subject, which method comprises: S, administering a Y4 receptor agonist to the transgenic nonhuman mammal of claims 43-48 wherein said mammal displays one or more physical and/or behavioural abnormalities; and (ii) determining whether said agonist alleviates any of the physical andlor behavioural abnormalities displayed by the transgenic nonhuman AI mammal. P:\OPER\MRO\15518-95.006- 6/1/99 -123 109. A method of diagnosing a predisposition to a disorder associated with the activity of a specific Y4 receptor allele which method comprises: obtaining nucleic acid from one or more subjects suffering from the disorder; performing a restriction digest of the nucleic acid with a panel of restriction enzymes; electrophoretically separating the resulting nucleic acid fragments on a sizing gel; contacting the resulting gel with the nucleic acid probe according to any one of claims 29 to 31 or the antisense oligonucleotide of i claim 32 or claim 33 for a time and under conditions sufficient for specific hybridization to occur, wherein said probe or oligonucleotide is labelled with a detectable marker; detecting labelled bands which have hybridized to the probe or oligonucleotide at and determining a unique band pattern that is specific to the nucleic acid of subjects suffering from the disorder; preparing nucleic acid obtained for diagnosis by steps and comparing the unique band pattern specific to the nucleic acid of subjects suffering from the disorder from and the nucleic acid obtained for diagnosis from to determine whether the patterns are the same or different and to diagnose thereby predisposition to the disorder if the patterns are the same. 110. A method of diagnosing a predisposition of a human or animal subject to a disorder associated with the activity of a specific Y4 receptor allele said method comprising the step of comparing a Y4 specific band pattern in nucleic acid from said subject to the Y4-specific band pattern obtained according to steps to A of claim 109, wherein identity in the band patterns is diagnostic of said P;\OPER\MRO\15518-95.006- 6/1199 -124- predisposition. 111. The method of claim 109 or claim 110, wherein a disorder associated with the expression of a specific Y4 receptor allele is diagnosed. 112. A method of prepar,;ig the isolated, purified Y4 receptor of claim 11 which method comprises: constructing a vector adapted for expression in a cell which vector comprises the regulatory elements necessary for the expression of nucleic acid in the cell operatively linked to the isolated nucleic i acid molecule according to any one of claims 1 to 10 to permit expression thereof, wherein the cell is selected from the group consisting of bacterial cells, yeast cells, insect cells and mammalian cells; inserting the vector of step in a suitable host cell; i incubating the cells of step under conditions allowing the *expression of Y4 receptor; recovering the receptor so produced; and purifying the receptor so recovered.

113. A method of identifying a chemical compound which specifically binds to a Y4 receptor, which method comprises: 4 contacting in one sample, non-neuronal cells expressing on their cell surface a Y4 receptor encoded by the isolated nucleic acid molecule according to any one of claims 1-10, with both a first chemical compound being tested and a second chemical compound that is known to bind to I the Y4 receptor, and separately, in another sample said nonneuronal cells with only the second chemical compound, under conditions suitable for the binding of both compounds; and (ii) detecting specific binding of the first chemical compound to the Y4 P:\OPER\MRO\15518-95.006 -6/1/99 -125- receptor, wherein a decrease in the binding of said second chemical compound to the Y4 receptor in the presence of said first chemical compound indicates that said first chemical compound binds to the Y4 receptor.

114. A method of identifying a chemical compound which specifically binds to a Y4 receptor, which method comprises: contacting, in one sample a membrane fraction from nonneuronal cells expressing on their cell surface the Y4 receptor encoded by the isolated nucleic acid molecule according to any one of claims 1-10, with both a first chemical compound being tested and a second chemical compound that is known to bind to the Y4 receptor, and separately, in another H *sample said nonneuronal cells with only the second chemical compound, S:under conditions suitable for binding of both compounds; and (ii) detecting specific binding of the first chemical compound to the Y4 S:I receptor, wherein a decrease in the binding of the second chemical Volk*# compound to the Y4 receptor in the presence of the first chemical compound indicates that the first chemical compound binds to the Y4 receptor.

115. A membrane preparation obtained from the cell according to any one of claims 21-28. ii i DATED this SIXTH day of JANUARY, 1999 Synaptic Pharmaceutical Corporation by DAVIES COLLISON CAVE Patent Attorneys for the Applicants A 9'q II